Abstract: The improved jump ropes devices described herein generally include a source of rhythmic sound, a sensor for determining the motion of the jump rope, and a visual output (e.g., feedback) for indicating how well a user is moving or jumping in time to the rhythmic component of the sound. The device may also include a controller for receiving input from the source of rhythmic sound and the sensor, and controlling the visual output. Methods of using the devices are also described.

Abstract: A method and system for assisting a user in maintaining a predetermined pace along a track with a specific predetermined end goal. The preferred embodiment uses a PDA or similar device to allow a user set a specific course goal and to enter (or download) a previous profile pace target along with checkpoint data for a specified track, detecting start/stop and checkpoints along a course, normalizing the user time at each checkpoint and providing wireless speech ‘behind/ahead’ feedback (either time or energy) to a user at each checkpoint along a specified track. The present invention may provide the user with a variable pace along a track or course utilizing upcoming terrain, percentage of work completed and/or user power profiles and may normalize a user goal to other competitors having faster or slower track times.

Abstract: An interactive exercise device for measuring and displaying exercise performance parameters, the interactive exercise device including a step measuring device that outputs a step signal corresponding to each step walked by a user, a processor for determining a plurality of exercise performance parameters based on the step signals output from the step measuring device, a memory for storing the determined exercise performance parameters, a menu-driven interface display for displaying a plurality of menus, the menus for displaying at least the determined exercise performance parameters, a user input device for operation by the user to select a display of one of the menus on the interface display and to provide input data corresponding to a selected display, and an interface connection for connecting the interactive exercise device to an external computing device, the interface connection supporting an upload of the determined exercise performance parameters from the interactive exercise device to the external co

Abstract: A portable performance monitoring apparatus for use in physical exercises, comprising an exercise performance sensor, signal processing means for processing exercise performance signals delivered by the exercise performance sensor and for transforming the exercise performance signals into performance parameters, means for converting the performance parameters into audio information, and means for delivering the audio information to a user.

Abstract: In accordance with one embodiment of the present invention, a device for monitoring a movement of a user includes a sensor module, a processor, and a feedback module. The sensor module is capable of generating positional information describing a movement of a user. The processor is capable of determining based on the positional information that the user has performed a predetermined movement. The feedback module is capable of generating sensory feedback in response to determining that the user has performed the predetermined movement.

Abstract: An intra-repetition exercise system which allows comparison of actual performance of intra-repetition exercise characteristics (2) to pre-established target performance of intra-repetition exercise characteristics (3) by an exerciser (1).

Abstract: A method for interpreting data representing forces and torques exerted by a right and left foot on a first and second plate treadmill to determine forces and torques exerted on the right and left foot over a specified period of time. A plurality of signals is preferably analyzed to produce data readings from the first and second plates to determine an occurrence of feet contact on the plates and feet departure from the plates. The data from the signals is then separated into a side A dataset and a side B dataset. Each of the datasets is then matched to one of the individual's feet. The resulting determination of forces and torques exerted on the feet provides a more complete analysis of an individual's progress during injury or rehabilitation.

Abstract: A retrofittable exercise data collection system and method of collection of data concerning the performance of weightlifters and the like which can be attached to a power rack used by weightlifters and detached after use or alternatively set up in freestanding arrangement in which by emitted electromagnetic radiation coupled detectors the movement of a barbell past such emitters may be detected and the speed of passage calculated by determining the interval between occlusion of the detector beams between adjacent detectors, the height of such occluded detectors being related to the portion of the musculature of the weightlifter that is undergoing extension or retraction during exercise.

Abstract: A system and method of hierarchical monitoring for subordinate assessment is described. Generally, the system receives remotely sensed data about a user's physiology and contextual state, and extracts features that are related to the workload currently being experienced by a single subordinate and/or group of subordinates. The system builds workload indices based on levels of these features. The system uses statistical process control techniques in conjunction with the workload indices to identify suboptimal user states. Information regarding a particular subordinate or the group of subordinates may be presented in a variety of different ways. As a result, a superior can easily determine the condition of the one or more subordinates and make task adjustments to influence workload levels.

Abstract: A personal training device is provided for a participant of pace-based physical training. The device includes an input for receiving an input signal indicative of a pace of the participant, and a comparator coupled to the input for comparing the pace of the participant to a predefined criteria. The personal training device further includes a training partner positioner for generating a position of a virtual training partner relative to the participant based on an output of the comparator, and a training partner audio source for providing audio representative of sounds from the virtual training partner. Still further, the personal training device includes a spatial audio processor for producing a multi-dimensional audio signal comprising the audio from the audio source, the multi-dimensional audio signal providing the audio at a spatial location represented by the position generated by the training partner positioner.

Abstract: In an elliptical step exercise apparatus distance traveled can be approximated by determining the portion of the ellipse traversed by a foot pedal where the user applies force to the pedal. This portion can be considered equivalent to the amount of foot travel on a treadmill and modified as a function of speed to simulate the gait of a user at various speeds so as to provide an approximation of the distance traveled by a user as if he were running on a treadmill. This process can be further modified for use with an elliptical exercise apparatus where the stride length can be changed such that the simulated distance will be increased with increased stride length.

Abstract: Improved systems and methods allow users to employ audio stimuli to provide a desired cadence set, series of pre-arranged and programmed stress inducing or mitigating periods, in combination with other desired parameters to allow users to recover from disease or bodily injury by following a prescribed methodology from a healthcare provider, or others, or to increase or enhance fitness. Conventional music delivery systems function in complement with the instant teachings, as do the business methods and related kits which are disclosed.

Abstract: An electronic console with a system for indicating the motion power having one large indicating area with light color change and one setting/comparing area. Judging from the change of light color in the indicating area, the observer (operator himself and other related persons) can easily acquire the relevant information of the current dynamic status of this exercise apparatus or the current physical status of the operator. Meanwhile, in the setting mode, the user can define a specific light color of the LED in this setting/comparing area to make a simple visual comparison with the light color in the indicating area to judge whether the current exercise or physical status of the user corresponds to that of the “setting color”.

Abstract: There is provided an audio pacing device including a sensing unit, such as heart rate monitoring unit, to obtain a parameter, such as heart-beat rate (pulse), of a user in physical exercise, a memory to store a plurality of audio signals having predetermined tempo indications (e.g. beats per minute values); and a processing unit configured to (1) determine whether the intensity of the parameter of the user should be increased, decreased or maintained by using the parameter of the user from the heart rate monitor and a predetermined reference value, and (2) dynamically select and render an audio signal having (or adjusted to have) an audio-tempo that enables the user to accordingly increase, decrease or maintain exercise intensity, respectively.

Abstract: The present invention is a method for selecting and modifying particular exercise videos from a stored database into a customized digital-format exercise regime viewable by an individual.

Abstract: A method (10) and system (50 or 200) for music selection based on pace can include tracking (12) a pace as used on an exercise equipment device (61), receiving (14) a pace value representative of the pace via a short range wireless transmission at an audio output device (51), searching (16) a media library within the audio output device for a media file with a pace closest to the pace value received, and presenting(18) a media file having the pace closest to the pace value received. The method can further optionally include t automatically playing (20) the media file if the pace closest to the pace value received is an exact match and adjusting (22) to the pace value the pace of a song when the song is within a user settable range or percentage of the pace value.

Abstract: A dive computer that includes heart rate monitoring capability is provided. The heart rate monitoring is accomplished by a belt that fits around the diver's chest, and the information is wirelessly transmitted to the dive computer. The heart rate information may be displayed during and after a dive, and the dive computer may selectively utilize the monitored heart rate information to compensate the decompression algorithm based on workload during the dive. The dive computer can also utilize the monitored heart rate information to compensate the decompression algorithm based on workload on the surface before and/or after the dive for no fly and repetitive dive calculations.

Abstract: To enhance precision in measurement of the number of steps even when a walk cycle changes. An acceleration detecting portion outputs a walk signal corresponding to a walk of a user detected by a walk sensor. A step number counting portion of a counting portion counts each signal which is judged to be beyond a first reference cycle range by a walk cycle comparing portion among signals from the acceleration detecting portion as the number of steps for one step, and when an extra-regulation step number processing portion judges that a predetermined number of signals each within a second reference cycle range among the signals each beyond the first reference cycle range is continuously outputted, counts the predetermined number of signals as the predetermined number of steps.

Abstract: A jump takeoff position indicator system that discloses the point of takeoff of a long jump or triple jump in athletic competition or practice when an athlete's foot comes in contact with a takeoff board when beginning a jump. A plurality of light beams are emitted parallel to the edge of the takeoff board. The light beams are closely spaced, parallel to each other, and transverse to the direction of the jump. The foot position is known by the location of the beams broken at takeoff. A light beam detector detects interruption of the light beams by an athlete's foot and displays the takeoff position on a plurality of visible LEDs. The system provides a memory for storing the takeoff position and recall switch for retrieving and displaying the information after completion of the jump. The system is immune from ambient light disturbances and can easily be moved between multiple takeoff board locations. Microcontrollers are employed in a modular fashion for system control.

Abstract: Exercise device and method in which one or more generally planar blades with major surfaces are attached to the ends of an exercise bar. The bar is gripped with the hands and moved in a direction generally perpendicular to the major surfaces, with movement of the bar being resisted by air resistance encountered by the blades.

Abstract: An aerobic exercise system for encouraging a person to exercise more which includes a doll having movable extremities which at least include arms and legs which are capable of moving in a predetermined aerobic manner. An aerobic video displays predetermined movements to be performed by the doll. There is a chip disposed within such doll which is connected to the arms and legs for causing predetermined aerobic movements of the doll which correspond to movements of the aerobic video. Additionally, there is at least one aerobic type bench for the doll to perform such predetermined aerobic exercises on.

Abstract: A wrist exerciser includes a casing comprised of upper and lower casing members mounted together to form a substantially spherical shape. A rotor has opposite shafts rotatably received in the holes defined in the casing for rotatably supporting the rotor in the casing. Illumination elements are mounted on an outside surface of the rotor. A power source is fixed in the rotor for powering the illumination elements. A control circuit is in electrical connection with the power source and the illumination elements for selectively lighting the illumination elements. A transmission device is mounted in the rotor and has an interface circuit connected to the control circuit and a socket connector in connection with the interface circuit.

Abstract: A methodology is disclosed for providing a physical therapy practitioner with practice-specific prescriptive exercise routine depictions as an effective way to enhance compliance of a home-based physical therapy regimen. The method comprises various steps, including assessing a given practitioner's commonly prescribed home-based exercise prescriptions, selecting certain of the exercises for comparison relative to a previously compiled digitized motion picture library containing excerpts showing various exercises. A decision is then made as to whether a representative exercise excerpt is endemic to the physical therapy practitioner. If the excerpt(s) are deemed satisfactory, DVD's are developed and provided to the practitioner. The practitioner may then properly prescribe a home-based physical therapy regimen during an office visit at which time a select set of the developed DVD materials are delivered to the patient.

Abstract: Disclosed is an exercise amount measuring device using as an exercise signal generator an inclination detector commercially available, which can detect two-dimensional movements. Use of such inclination detectors facilitates the assembly of exercise amount measuring devices. The inclination detector 1 is connected to a counter circuit via an input circuit, and the input circuit and the counter circuit are connected to an MPU via an input-and-output port. The input circuit comprises a CR circuit or a flip-flop circuit. The counter circuit counts input pulses post-chattering exclusion, which input pulses are caused by the on-and-off switching actions, which are brought every time the contact ball touches selected contact electrodes in the inclination detector.

Abstract: A personal training device (10) adapted to assist a user in reaching performance goals, navigating, and accumulating performance statistics. In a preferred embodiment, the device broadly comprises a housing (10); an attachment mechanism (30); a GPS component (40); a user interface (50), including an input portion (52) and an output portion (54); a processor (60), including a timer (62) and a memory element (64); a data interface (70), including an input portion (72) and an output portion (74); an audio component (80); and a power supply (90). The device (10) is adapted to store goal information, monitor performance using GPS-derived data, and communicate performance information.

Abstract: A pedometer for detecting vibrations in a direction of motion is disclosed. The architecture of the device includes a main body, a vibration detector, and a counting circuit. The counting circuit is connected to the vibration detector and the counting circuit and vibration detector are installed inside the main body. Since the vibration detector is disposed orthogonal to the direction of motion, the vibration detector is able to detect the smallest vibration in the direction of motion and outputs a pulse signal to the counting circuit. The counting circuit includes a signal amplifier circuit, a signal detection circuit, and a processor. This pedometer is capable of picking up weak vibration signals to take an accurate count of the jogger's pace.

Abstract: The invention relates to an electronic wrist-worn device, such as a heart rate monitor, a sportsman's watch or a diving computer, and its control method. The outside of the casing of the device comprises a bottom surface to be placed against the wrist, a top surface (304), and a side surface (308) between the bottom surface and the top surface (304). On the top surface (304) of the casing there is provided a first display (306) connected to the control electronics. On the side surface (308) of the casing there is provided a second display (400, 402, 404; 406) connected to the control electronics. The best viewing angle of the first display (306) and the best viewing angle of the second display (400, 402, 404; 406) are at an angle of 60 to 120 degrees with respect to each other.

Abstract: A treadmill operation mode control system for use in a treadmill is disclosed include two ultrasonic transmitter receiver units respectively installed in the upright support of the base frame of the treadmill at two sides, and a microprocessor electrically connected between the ultrasonic transmitter receiver units and the instrument panel of the treadmill and adapted to accelerate the speed of the treadbase motor of the treadmill when the user moving a part of the body toward one ultrasonic transmitter receiver unit, or to reduce the speed of the treadbase motor when the user moving a part of the body toward the other ultrasonic transmitter receiver unit.

Abstract: There is provided a system capable of estimating biological data such as a pulse at the time of walking (exercise) with good reproducibility. Biological data at the time of walking is estimated indirectly by acquiring a relationship between biological data and exercise stress levels in body burden capacity acquiring means 21 prior to walking, acquiring an exercise stress level at the time of walking in means 22 for acquiring an exercise stress level at the time of walking, and relating the exercise stress level at the time of walking to the relationship between biological data and exercise stress levels in means 23 for estimating biological data at the time of walking. Further, a walking amount is also computed by use of the biological data at the time of walking in walking amount computing means 24.

Abstract: A body motion detector, to be attached to or carried by a user for detecting body motions of the user, uses a plurality of sensors each for detecting body motions in a specified direction to output a body motion signal according to the user's body motion. These sensors are disposed so as to detect the body motion in different directions. One of these sensors are selected by carrying out calculations on signals outputted from the sensors. The user's body motion is detected by using selectively output signals from the selected body motion sensor. The body motion detector may also include a component for detecting the orientation of the body motion detector itself from signals outputted from these sensors and another component for detecting the user's body motions by carrying out calculations on the signals outputted from these sensors, corresponding to the orientation as detected by the orientation detecting component.

Abstract: The invention is directed to a gait rehabilitation aid and to a method for aiding gait rehabilitation. The gait rehabilitation aid resides in a treadmill having a belt which speed matches a user's own step cycle based on let length and which provides feedback in the form of an evaluation with respect to the user's length, cadence, gait velocity and gait pattern. A controller that is responsive to a user input device is employed to input information that inputs information pertaining to any one of cadence and leg length sets the belt speed to match an appropriate step cycle. In addition, footprints are scrolled on a display together with foot falls that correspond to actual heel strike events on the treadmill belt. The footprints appear in accordance with the user's own step cycle.

Abstract: An electronic activity monitor for monitoring the performance of an activity such as an exercise comprises an activity detector responsive to motion associated with the performance of the activity to output a corresponding signal, a processor for receiving the signal and determining a starting address at which a block of corresponding sound data is stored, a memory for storing sound data corresponding to a plurality of values associated with the monitored activity, the sound data preferably comprising data representing a voice representation of the values, and a speech generator for generating a naturally-sounding human voice or reproducing a pre-stored version of an actual human voice or other audible indicia in accordance with the sound data stored in the memory. The speech generator is controlled by the processor in response to the activity detector to provide a verbal representation of the user's performance of the activity.

Abstract: Disclosed is an exercise amount measuring device using as an exercise signal generator an inclination detector commercially available, which can detect two-dimensional movements. Use of such inclination detectors facilitates the assembling of exercise amount measuring devices.

Abstract: A turning control device for a virtual stationary bike includes a video monitor and a computer program. The program is driven by a flywheel of the bike to show images of a rider on the bike on a road. A control case is fixed at the lower end of the handle with a sensor fixed inside for sending signals, with a shade plate that moves with the handle. The shade plate is positioned between two circuit boards, and has a plurality of opening for controlling lights emitted by electronic elements of the two circuit boards. The handle Controls the shade and the sensor to send out different signals so that the video monitor shows images of the rider on the bike moving in directions according to the command of the computer program, permitting the rider to feel as though he were riding on a road to enhance the pleasure of exercise.

Abstract: The invention is directed to apparatus and a method of playing a skill game, conducting exercise, or learning movements such as dance steps. Ordinarily, it would be used for contact by the feet, but it could be used for contact by the hands, particularly in connection with physical therapy activity or the like. The contact surfaces are arranged in a coordinated pattern that may consist of a matrix of adjacent colored illuminatable tiles or simply stepping stones positioned in a random array perhaps quite different from a regular matrix. The contact surfaces are illuminated normally one at a time so as to cue sequential steps in a random pattern and at varying speeds in a game. Changes may also be made in a regular repeatable pattern with predetermined timing rhythms of a dance or may be made variable so that they may be slowed or quickened in therapy as the patient progresses.

Abstract: An interactive video display and computer system which provides changing video images in response to a combination of signals received from repetitive body movements and voice commands. The system comprises a pace sensing apparatus which is worn on the user's body which senses the repetitive body motion, translates that motion into a signal and transmits the pace signal to a signal receiver, which translates the signal into a signal readily recognized by a computer and then delivers the signal to the computer system. The system further comprises a voice receiving mechanism for receiving voice commands and transmitting a voice signal to the computer system. The user controls the perceived rate of motion and perceived direction of travel, as well as other aspects of the video image, by pace and voice.

Abstract: A piece of exercise equipment includes an electronic game of chance connected thereto. A switch or other device may also be connected to the combination system to operate the electronic game of change when the piece of exercise equipment is in use. The combination system also includes a controller which detects a combined action of playing the electronic game of chance and using the exercise equipment. The system electronically connects the gambling device to the piece of exercise equipment and detects when an operator is using both the exercise equipment and the electronic game of chance simultaneously.

Abstract: An electronic jump rope that generates beat tracks or sound segments in response to user actuation of switches is disclosed. In one embodiment, the electronic jump rope is provided with a first handle (12), a second handle (14) and a flexible element (16) connected between the first and second handles (12, 14). One of said first and second handles (12, 14) having a first switch (22), a second switch (20), a speaker (50) and a sound generator (90) disposed therein. The sound generator (90) includes a memory (108, 110), a processor (106) and an input/output circuit (106) and is operatively coupled to said first and second switches (20, 22) and said speaker (50), said sound generator (90) being programmed to cause said speaker (50) to play a beat track when said second switch (20) is actuated and programmed to cause said speaker (50) to play a sound segment when said first switch (22) is actuated.

Abstract: A system for measuring the speed of a person while running or walking along a surface. A single acceleration sensor measures the acceleration in the forward direction and provides an acceleration signal which is amplified and subsequently sampled by analog to digital converter. The digital signal is processed by a microprocessor which executes an algorithm that determines the stride length and the stride duration from the digitized acceleration signal and calculates the speed and the distance traversed. The information thus obtained is transmitted by means of a radio frequency transmitter and received by a radio frequency receiver in a watch or other device which comprises a display which can be viewed by the runner or walker. The speed and distance traversed is displayed on the display, along with other useful information, such as average speed, maximum speed, total distance traversed, calories expended, and heart beat.

Abstract: A swing tempo training device is provided which may be used to teach proper swing tempo. The disclosed swing tempo training device comprises an accelerometer coupled to a voltage-to-frequency converter, and an output means coupled to the voltage-to-frequency converter. The accelerometer measures the real-time acceleration of a swinging object and produces a first voltage signal with a voltage level related to the measured real-time acceleration. The voltage-to-frequency converter then converters the first voltage signal into a second voltage signal with a frequency related to the first voltage level. The output means then outputs the second voltage signal. Preferably the output means comprises a frequency modulator and a FM transmitter.

Abstract: A pedometer includes a main body 1, two acceleration sensors 3 and 4 supported in an oscillating manner in a horizontal direction and a vertical direction at a substrate 2 within the main body 1, an angle detection sensor 5 for detecting an angle of inclination of main body 1 to the ground, and a pace counter for selecting output of either acceleration sensor 3 or 4 according to an output of angle detection sensor 5 for counting the number of paces thereby.

Abstract: An educational game is disclosed which uses a series of illumination devices which are sequentially illuminated to illustrate to a user a velocity. The user selectively chooses the velocity at which the illumination devices are sequenced and therefore can race against the sequence of illumination devices or monitor same. In either event, the sequence of illumination devices having been illuminated at the selected speed, allowing the user to interact, using mind and body with the phenomenon of speed allowing the user to experiment with concepts of speed and velocity. A further embodiment is shown wherein a series of audible devices in conjunction with the illumination devices are selectively actuated to illustrate to the user the velocity.

Abstract: A training apparatus for improving the performance of a swimmer. In a first aspect of the invention, a propeller rotates about an axis which is aligned with the path of the swimmer. A permanent magnet driven by the propeller attached to the swimmer produces a rotating magnetic field which acts on a magnetic field transducer to produce a pulsating signal whose frequency varies directly with the swimmer's speed. The sensor's output is multiplied, amplified and fed to an earphone worn by the swimmer. Changes in frequency immediately inform the swimmer of whether his performance has improved or deteriorated. In a second aspect of the invention, permanent magnets are mounted on vanes of an impeller which rotate about a horizontal axis which is at right angles to the path of the swimmer. Rotating magnetic fields of the permanent magnets act on a magnetic field sensor to produce a pulsating signal whose frequency varies with the swimmer's speed.

Abstract: A swing tempo training device is provided which may be used to teach proper swing tempo. The disclosed swing tempo training device comprises an accelerometer coupled to a voltage-to-frequency converter, and an output coupled to the voltage-to-frequency converter. The accelerometer measures the real-time acceleration of a swinging object and produces a first voltage signal with a voltage level related to the measured real-time acceleration. The voltage-to-frequency converter then converters the first voltage signal into a second voltage signal with a frequency related to the first voltage level. The output then outputs the second voltage signal. Preferably the output comprises a frequency modulator and a FM transmitter.

Abstract: A training method with a visual display for a swimmer. A compact apparatus is mounted on a mid-portion of a swimmer for generating a fluctuating signal which varies in frequency according to the speed of the swimmer. The swimmer changes his form and/or movement to vary the frequency of the signal. The signal is processed to produce a fluctuating visual signal which is communicated by a visual display to the swimmer to immediately inform him whether the change in form or movement has increased or decreased his speed.

Abstract: The invention presents a step count data control system allowing to walk easily and continuously in order to improve health or maintain health, which includes step counting means for counting the number of steps, input means 11 for entering the step count data, recording means 12 for recording daily step count data entered by the input means 11, operating means 14, 15, 16 for operating according to the step count data, and output means 17, 18 for issuing data, in which the step count data entered by the input means 11 and recorded in the recording means 12 is operated in the operating means 14, 15, 16, and the average in a month, the total, the target value in a month, the walking distance converted from the step count, evaluation, past record and its comparison, advice, comment and other data are issued to the output means 17, 18.

Abstract: A track runner pacing device is provided including a running track. A pacer housing is adapted to move around the running track. A control mechanism serves to effect the movement of the pacer housing about the track at a speed calculated from a distance and time entered into the control means by a user.

Abstract: An exercise device is provided having a resilient or flexible front impact surface and a plurality of identification indicia for identifying target areas on the flexible impact surface. The exercise device preferably utilizes lights as the identification indicia that are resiliently mounted to the exercise device which are sequentially operated by a microprocessor to force an athlete to contact the identified area on the impact surface while speed, strength and agility may be measured and analyzed by the microprocessor. The software for operating the microprocessor provides a wide range of workout levels and routines and imparts the ability to identify weak areas in the performance of the athlete and provide specific future training routines to improve overall performance in speed, agility and power.

Abstract: A programmable pacing device for helping a user to achieve a desired pace or tempo. The device is capable of emitting a plurality of different audible signals, each signal conveying selected pacing information to the user, and may be used by athletes to help in training or race pacing. The device may comprise a single unit or two separate units; an input unit and a signaling unit and as a single unit the device may form part of a pair of swimming goggles.

Abstract: An athletic performance evaluation device utilizes ultrasonic sensing circuitry or infrared sensing circuitry, a vibration sensitive switch, and an audio input to signal a microprocessor to start a timing function that calculates therefrom an objective evaluation of the athlete's performance. A light emitting diode (LED) may be included in the apparatus to signal the athlete to begin performance while simultaneously starting the timing function. The vibration sensitive switch may be placed on the ground adjacent to a selected position on which the athlete stands to stop the timing function. In operation, the athlete jumps and the ultrasonic sensor signals the microprocessor to begin the timing function and the vibration sensor sends a second signal to stop the timing function when the athlete lands again. The interval between signals is used in distance formula h=g(I/2).sup.