Abstract: A belt for a treadmill includes a carrier belt and a tread surface arranged on the carrier belt. The tread surface has pockets which are separate from one another. The pockets are filled, or can be filled, with a filler material.

Abstract: The present invention is directed to a treadmill belt with foamed cushion layer and method of making same. In one embodiment, the treadmill belt includes a fabric base layer and a foamed cushion layer foamed on and integral with the fabric base layer. The foamed cushion layer includes a thermoplastic composition and has a Shore A hardness of about 20 to about 80. In one example, the first foamed cushion layer is from about 0.05 inches to about 0.35 inches thick. The thermoplastic composition, prior to being foamed, includes about 1 part to about 5 parts of a foaming agent, e.g., a chemical foaming agent, based on 100 parts thermoplastic material, e.g., polyvinyl chloride. An outer wear layer is securely adhered on the foamed cushion layer to sandwich the foamed cushion layer between the fabric base layer and outer wear layer thereby defining the treadmill belt.

Abstract: The invention relates to a training and/or rehabilitation device in which a walking or running treadmill 2 is arranged in a water tank with flowing water 9. To be able to use said device regardless of the design of the water tank, the walking or running treadmill 2 can be used together with a stream generator 3 as a unit in the water tank or in open water.

Abstract: The present invention relates to a manually operated treadmill adapted to generate electrical power comprising a treadmill frame, a running belt supported upon the treadmill frame and adapted for manual rotation, and an electrical power generator mechanically interconnected to the running belt and adapted to convert the manual rotational motion of the running belt into electrical power.

Abstract: A manually operated treadmill and methods of using the same are provided. The treadmill includes a treadmill frame having a front end and a rear end opposite the front end, a front shaft rotatably coupled to the treadmill frame at the front end, a rear shaft rotatably coupled to the treadmill frame at the rear end, and a running belt including a curved running surface upon which a user of the treadmill may run. The running belt is disposed about the front and rear shafts such that force generated by the user causes rotation of the front shaft and the rear shaft and also causes the running surface of the running belt to move from the front shaft toward the rear shaft. The treadmill is configured to control the speed of the running belt to facilitate the maintenance of the contour of the curved running surface.

Abstract: Provided is a treadmill-related technology. That is, the treadmill device and the operating method of the same is configured to detect a user who is taking exercise in real time, take pictures of the detected user's looks, and insert user image data as the results of data analysis, which are obtained from the taken pictures, into a virtual 3D object moving image which indicates the selected exercise course background, so as to project a 3D user image in which the user's behavior patterns are engaged with a virtual 3D object moving image. Therefore, since the treadmill device is used to allow a user to see his own looks taking exercise in real time, it is possible to prevent the user from feeling boring during exercise, and it is easy to continuously check the user's own physical status or conditions.

Abstract: An exercise device employing side-by-side pivotally supported moving surfaces. In one particular example, an exercise device employs a first belt deployed about a front roller and a rear roller and an adjacent second belt deployed about a front roller and a rear roller. The rear of the belts in the area of the rear rollers are pivotally secured and the front of the belts in the area of the front roller are adapted to reciprocate in an up and down motion during use. In some implementations, the moving surfaces include an interconnection structure such that a generally downward movement of one surface is coordinated with a generally upward movement of the other surface. In other implementations, the moving surfaces are operably associated with one or more resistance elements that effect the amount of force required to pivot or actuate the moving surfaces.

Abstract: An exercise treadmill having an endless exercise surface for walking or running while exercising, a resistance mechanism for providing a resistance for simulating the pushing of a load, wherein the resistance can be adjusted and set to a specific resistance setting. A movable pushing handle or handles is or are operatively attached to the resistance mechanism to transfer the load to the user. The resistance mechanism applies a constant and static force to the pushing handle(s) only in the same direction the endless movable surface moves and opposite a pushing direction such that operating the treadmill simulates the pushing of a load by a combination of gripping and pushing the pushing handle(s) forward while walking or running forward.

Abstract: A new apparatus, system and method for fall prevention training is provided that delivers, studies and analyzes the biomechanics of a disturbance event, such as a slip or trip incident, so that an appropriate response can be executed by the person to reduce or eliminate the number of falls experienced. The apparatus includes a platform that delivers a disturbance event in less than about 500 ms and preferably in the range of about 100 ms to about 200 ms. The method includes a unique protocol for fall prevention training using the apparatus. The disturbance event can create instability in the joint of the individual. An individual's walking gait can be monitored with the portions thereof detected. A disturbance event can be triggered when a given portion of the walking gait is detected. Also, the disturbance even can be triggered manually, at preset intervals or according to preset script.

Abstract: An electric treadmill with a folding mechanism by use of a swivel piece includes a handrail frame mounted at both sides of the front end of the base frame. Moreover, an axle is positioned near the middle portion of the bottom of the base frame for pivotally connecting with a swivel piece at both sides thereof, respectively. A pull rod is pivotally interposed between the swivel piece and the handrail frame. Moreover, a rear support frame having ground-touching rollers is pivotally connected to the axle such that the rear support frame is constantly supported by a telescopic support element. When the base frame is folded upward, the rear support frame is pushed forward by an action portion of the telescopic support element. Meanwhile, the ground-touching rollers are always in contact with the ground in a supporting position. In this way, the base frame can be brought in a stable folded-up position.

Abstract: Adjustable sensors for use with exercise apparatus are described. An example apparatus includes a support frame to assist a user in an exercise and a sensor integral with the support frame. The sensor is to detect a physiological condition of the user through physical contact with the user, and a position of the sensor is adjustable by the user.

Abstract: An electric treadmill with a folding mechanism by use of a swivel piece includes a handrail frame mounted at both sides of the front end of the base frame. Moreover, an axle is positioned near the middle portion of the bottom of the base frame for pivotally connecting with a swivel piece at both sides thereof, respectively. A pull rod is pivotally interposed between the swivel piece and the handrail frame. Moreover, a rear support frame having ground-touching rollers is pivotally connected to the axle such that the rear support frame is constantly supported by a telescopic support element. When the base frame is folded upward, the rear support frame is pushed forward by an action portion of the telescopic support element. Meanwhile, the ground-touching rollers are always in contact with the ground in a supporting position. In this way, the base frame can be brought in a stable folded-up position.

Abstract: An exercise apparatus comprising a lower body exercise machine, at least one upper body exercise module positioned for engagement by a user of the machine, each module adapted to provide resistance to the user's full natural arm swing. Each module comprises an elongated connector, a user engagement connected to one end of the elongated connector for engaging or being engaged by a body appendage of a user, and a resistance mechanism for resisting a tensile force applied to the end of the elongated connector. The lower body exercise machine includes an exercise bicycle adapted for use with the upper body exercise module. The resistance mechanism includes a reel through which the elongated connector is wound and the reel containing a means of providing resistance against the action of the user.

Abstract: A combination unit for hydrotherapy and exercise having a rubber dampening pad containing pre-drilled holes for the interchanging of exercise devices such as treadmills, bicycles, and elliptical machines. The unit has stairs for rear entrance and a clear splash guard for safe use indoors. The unit has a seat with shoulder and back jets located behind the seat, stability bars and a control panel. The control panel provides temperature control, aquatic jet flow, exercise equipment control and controls for MP3 players and the like. The unit has a water motor for driving certain exercise equipment.

Abstract: Disclosed are an underwater treadmill system and a method of exercising involving the underwater treadmill system. The underwater treadmill system includes a fluid-driven treadmill belt and a housing including a jet. The method includes selectively driving a fluid-driven treadmill belt by selectively providing a fluid to a treadmill drive unit and selectively expelling water through a jet positioned within a housing of the underwater treadmill system.

Abstract: An exercise treadmill having an endless exercise surface for walking or running while exercising, a resistance mechanism for providing a resistance for simulating the pushing or pulling of a load, wherein the resistance can be adjusted and set to a specific resistance setting. A movable pushing and pulling means is or are operatively attached to the resistance mechanism to transfer the load to the user. The resistance mechanism applies a constant and static force to the pushing and pulling means only in the same direction the endless movable surface moves and opposite a pushing or pulling direction such that operating the treadmill simulates the pushing or pulling of a load by a combination of gripping and pushing or pulling and moving the pushing and pulling means forward or backwards while walking or running forward or backwards.

Abstract: An apparatus comprising a rigid member movably supported overhead of a user wherein the rigid member has guiding arrangement for guiding a handle of the rigid member through a path having a vertical component, and wherein said handle has a biasing arrangement for biasing the handle toward an upper end of the path.

Abstract: A method and/or a device may limit a distance traveled by a treadle assembly in an exercise device. For example, the distance traveled by the treadle assembly may be limited by limiting a distance that a resistance element operably coupled to the treadle assembly may travel. An exercise apparatus may include a travel-limiting device or capability.

Abstract: A partially-inlaid treadmill system includes a running deck, a wide belt assembled on two parallel rollers to slide over the running deck, side handrails, a panel for controlling and monitoring the treadmill system, a partition that separates a first part of the treadmill system positioned for access to the user from a second part of the treadmill system that includes mechanisms and electro-electronics for driving the belt, incline devices, belt lubrication, ventilation and regulating devices, an emergency control lever, a drawer, a plurality of directional ventilation openings, and an aisle provided on the same side of the partition as the second part of the treadmill for accessing components of the second part of the treadmill system.

Abstract: An endless cord exercise machine in which a user applies a continuous pulling motion to a cord that is attached to a resistance mechanism is disclosed. The machine may be arranged to simulate the acts of rope climbing or of scaling a wall with the assistance of a rope, or may be arranged to provide other types of upper and lower body muscle development. The resistance mechanism is ideally comprised of a plurality of rotary viscous dampers of differing viscosities housed in a rotating drum. A spring-loaded adjustment key mechanism extending through the hub of the drum and dampers allows the user to selectively engage any combination of dampers to provide exercise resistance.

Abstract: A cushioned treadmill is provided for cushioning impact between a runner's feet and the treadmill platform. The cushioned treadmill includes a base and a platform coupled to the base. The platform has a first side and a second side. A belt assembly is coupled to and extends between the first side and the second side of the platform. The belt assembly includes a movable belt forming a running surface designed for supporting a user on the platform. A cushioning material is contained in a flexible bladder positioned in the platform beneath the running surface.

Abstract: This invention relates to a whole body vibrator platform which is attachable to a treadmill. The treadmill belt provides the power to move the platform, translating the horizontal, linear, belt movement into vertical oscillations through one or more eccentrically mounted rollers which support the platform. A person standing on the vibrator platform experiences a vertical vibration at frequencies established by the linear velocity of the treadmill belt.

Abstract: An exercise treadmill having an endless exercise surface for walking or running while exercising, a resistance mechanism for providing a resistance for simulating the pushing of a load, wherein the resistance can be adjusted and set to a specific resistance setting. A movable pushing handle or handles is or are operatively attached to the resistance mechanism to transfer the load to the user. The resistance mechanism applies a constant and static force to the pushing handle(s) only in the same direction the endless movable surface moves and opposite a pushing direction such that operating the treadmill simulates the pushing of a load by a combination of gripping and pushing the pushing handle(s) forward while walking or running forward.

Abstract: A wheelchair-accessible treadmill with a safety system allowing wheelchair users to exercise without the risk off steering off-course, tipping over, or rolling backwards off the treadmill. The wheelchair is secured by straps or similar means to two or more linear bearings that move along the side of the treadmill on rods or in tracks. When securely fastened, these allow the wheelchair to move forward and backward on the treadmill belt. The treadmill belt may be wider than standard, the height may be lower than standard, and a ramp may be used for access. An optical sensor may be used to determine the forward and backward movement of the wheelchair user. Wheelchair specific programs may be available through the control panel.

Abstract: A treadmill apparatus having a non-motorized tread, a sensor for sensing a parameter indicative of the tread speed, and a controller operatively connected to an angle adjustment mechanism to increase and decrease the angle of the tread. During operation of the treadmill, the controller compares the speed of the tread to a target speed, and based on the comparison, adjust the angle of the tread so that the operator's weight will adjust the speed of the tread.

Abstract: An exercise device employing side-by-side pivotally supported moving surfaces. In one particular example, an exercise device employs a first belt deployed about a front roller and a rear roller and an adjacent second belt deployed about a front roller and a rear roller. The rear of the belts in the area of the rear rollers are pivotally secured and the front of the belts in the area of the front roller are adapted to reciprocate in an up and down motion during use. In some implementations, the moving surfaces include an interconnection structure such that a generally downward movement of one surface is coordinated with a generally upward movement of the other surface. In other implementations, the moving surfaces are operably associated with one or more resistance elements that effect the amount of force required to pivot or actuate the moving surfaces.

Abstract: Gait analysis apparatus using a treadmill, comprising an endless belt, which is guided over at least two rollers and the upper surface of which serves as walking surface, a sensor system for determining a pressure/force distribution on a measurement plate located underneath the endless belt and having a plurality of pressure/force sensors arranged in a matrix on the side facing the treadmill belt, wherein the measurement plate comprising the plurality of pressure/force sensors arranged in a matrix is itself supported by at least one base force sensor and the analyzing unit comprises an additional signal input connected to a signal output of the base force sensor as well as an additional signal processing stage for processing the output signal of the or each base force sensor in terms of a calibration or correction signal processing of the output signals of the pressure/force sensors arranged in a matrix, respectively.

Abstract: An elastic platform is provided a treadmill. The elastic platform includes a frame and a piece of fabric. The frame is connected to the treadmill. The piece of fabric is supported on the frame. The piece of fabric supports a section of a belt wound around two rollers of the treadmill.

Abstract: A physical therapy apparatus for use in conjunction with a treadmill provides an assistive force to a forward movement of the legs. A force assistance device is adapted to attach to the feet or legs of a patient positioned on a motorized treadmill to assist in walking therapy by providing an assistive force to a forward movement of the patient's feet or legs. An adjustment device may vary an interface of attachment, for example, the height or direction, between the force assistance device and the patient's feet or legs. A force arresting device may arrest the assistive force provided by the force assistance device during the forward movement of the patient's feet or legs. The force assistance device provides a substantially constant assistance force during the forward movement of the patient's feet or legs. The physical therapy device may also include a force adjustment device connected with the force assistance device to vary the magnitude of the assistive force.

Abstract: A treadmill conversion resistance training apparatus includes mirror-image left and right attachments for attaching to treadmill vertical support columns, each attachment having a vertical mounting bracket removably attachable to a vertical support column; a translation member rotatingly connectable to the vertical mounting bracket at a translation axis; resistance straps removably connectable between the translation member and the mounting bracket; a handle connectable to the translation member and lockable at selected angles; wherein, the treadmill to continues to function as an treadmill while the apparatus is attached. A treadmill conversion apparatus includes a handle having an articulation joint lockable at selectable angles. A treadmill conversion apparatus includes a handle joint having adjustable resistance portion.

Abstract: A treadmill with lateral shift effect includes a main frame, two swinging levers, with a pin joint set at the top and a swinging end formed at the bottom. The pin joint is pivoted onto the stands of the main frame. A movable rack is transversely set overhead the pedestal of the main frame and both ends of the movable rack are separately connected with the swinging end of two swinging levers. A treading mechanism is set on the movable rack and has a base frame, an upper swinging set, a lower swinging set and two pedals. The bottom of the base frame is assembled fixedly onto the movable rack, the upper/lower swinging sets are pivoted centrally on top of the base frame, and the bottom of two pedals is provided with an assembly seat for assembly and connection of two ends of upper/lower swinging sets.

Abstract: The exercise apparatus of the present invention comprises a treadmill 11 having a generally vertical running surface 14, and a bench 12 for supporting a user's upper body and hips. The angle of the running surface is adjustable relative to the ground within a range of angles, including a vertical angle. The bench may be positioned so that the feet of a user supported thereon may contact the running surface of the treadmill to exercise. The bench comprises a seat 23 and a back support 22, wherein the relative angle and position of the seat and back support are independently adjustable.

Abstract: Provided is a treadmill-related technology. That is, the treadmill device and the operating method of the same is configured to detect a user who is taking exercise in real time, take pictures of the detected user's looks, and insert user image data as the results of data analysis, which are obtained from the taken pictures, into a virtual 3D object moving image which indicates the selected exercise course background, so as to project a 3D user image in which the user's behavior patterns are engaged with a virtual 3D object moving image. Therefore, since the treadmill device is used to allow a user to see his own looks taking exercise in real time, it is possible to prevent the user from feeling boring during exercise, and it is easy to continuously check the user's own physical status or conditions.

Abstract: A running surface for a common exercise treadmill has an endless belt made of a rubber like material leaving a smooth finish to its upper and lower surfaces. At least one line of spaced apart holes penetrate the belt along its entire length. The holes enable fastening elements to affix generally circular rods to the upper surface to engage fastening eyelets by means of the fastening elements which are installed into at least one strengthening endless belt positioned below and urging against the lower extremity of the endless belt. The generally circular rods have prefabricated objects such as simulated cobblestones of various sizes and configurations in immediate adjacency to the upper extremity of the endless belt.

Abstract: A sensor unit installed in a premises for detecting a user's walking behavior. Connected to the server through a communication network are a server, an information reporting unit, and an exercise machine. The server includes a diagnosis section for analyzing time series data of walking signal from the sensor unit to determine walking ability and generate walking ability data indicative thereof, and an information providing section which provides the walking ability date to the information reporting unit and the exercise machine. The information reporting unit includes reporting means for reporting the determined walking ability to the user. The exercise machine includes a control section which gives an exercise to the user depending upon the walking ability.

Abstract: The various embodiments of the present invention generally provide a control system and a process for an exercise apparatus configurable into a combined treadmill and stepper mode. The apparatus may also be configured into stepper only and treadmill only modes. The apparatus generally includes a master control unit, a first sensor, in communication with the master control unit, which generates a first signal indicative of an effective tread speed for the apparatus, and a resistive element that includes at least one resistance level. Using the first signal, the resistance level, and empirical information, the amount of energy expended by a user of the apparatus may be calculated and the operation of the apparatus controlled. Various sensors, actuators and information, such as that obtained from various data structures, may be utilized in performing calculations and controlling the features, functions and operation of the apparatus.

Abstract: A selectively inclining hiking exercise apparatus supports a user ambulating thereon. The selectively inclining hiking exercise apparatus includes a support base and a treadbase that selectively inclines with respect to the support base. The treadbase includes a motor for driving an endless belt upon which the user ambulates. The treadbase also includes a magnetic braking assembly for regulating the speed of the endless belt to prevent the endless belt from moving at a rate that is faster than the rate at which the treadbase motor is driving the endless belt. The magnetic braking assembly includes a magnet that selectively moves relative to the treadbase flywheel along a threaded lead screw to provide the braking force.

Abstract: A shock/impact absorbing structure of a treadmill wherein a second roller set is positioned correspondingly at the internal side of the first roller set and includes a front and a rear roller disposed at the front and rear ends of the supporting board. A shock/impact absorber is positioned around the second roller set. The top side of the shock/impact absorber is directed to the internal side of the running belt. When the operator steps on the running belt, the shock/impact absorber is forced to be moved in rotation by the running belt such that the shock/impact absorber has a certain region in constant contact with the supporting board, thereby providing a direct shock/impact absorbing interface for the running belt. In this way, the noise can be reduced and the injuries during the exercise sessions can be avoided.

Abstract: A conveyor belt for a treadmill has a contoured structure on its upper surface which causes a runner to experience bumps and depressions when running. The contoured features may be provided by plates attached to the conveyor belt, and/or by inserts placed onto the belt or within chambers defined in the belt. The contoured features may vary in hardness.

Abstract: Disclosed herein are a roller, a method for using the roller, and a treadmill incorporating the roller. The roller may be integrally structured and have a pipe wall thickness at intermediate portion less than a pipe wall thickness at an end portion, and towards the end portion, a pipe wall size at the intermediate portion transited into a pipe wall size at the end portion. The roller can serve as a transmission member and may be used in a treadmill.

Abstract: An apparatus for carrying out a motor activity for playing or sporting purposes, comprising a cylindrical structure (1) housing therein a footboard (2), which is characterized in that said footboard (2) is of cylindrical shape and is revolvingly mounted internally to said structure (1), the arrangement being such that a user in order to carry out the motor activity places him/herself on said footboard (2) and internally to said cylindrical structure (1).

Abstract: An exercise treadmill having an endless exercise surface for walking or running while exercising, a resistance mechanism for providing a resistance for simulating the pushing or pulling of a load, wherein the resistance can be adjusted and set to a specific resistance setting. A movable pushing and pulling means is or are operatively attached to the resistance mechanism to transfer the load to the user. The resistance mechanism applies a constant and static force to the pushing and pulling means only in the same direction the endless movable surface moves and opposite a pushing or pulling direction such that operating the treadmill simulates the pushing or pulling of a load by a combination of gripping and pushing or pulling the pushing and pulling means forward or backwards while walking or running forward or backwards.

Abstract: An exercise treadmill for simulating a dragging or pulling action, having an endless moveable surface looped around rollers or pulleys to form an upper run and a lower run, with an exercise surface for walking or running on while operating the treadmill; and a moment arm weight resistance means for simulating the dragging or pulling of a load.

Abstract: An exercise device includes a support frame and a continuous running surface supported by the support frame. The support frame defines a horizontal plane having a longitudinal axis. The continuous running surface includes a movable belt and a plurality of sections mounted thereon and extending along a longitudinal axis of the belt. Each section includes an upper surface defining at least one inclined portion that is laterally inclined relative to the horizontal plane of the support frame. Adjacent upper surfaces of the plurality of sections define at least one laterally inclined track of the running surface.

Abstract: A foldable treadmill includes a base and two posts are pivotably connected to the base. A handle is pivotably connected between the two posts and includes at least one pivotal end which is connected the two posts. A positioning unit is located between the two posts and includes a transverse link and at least one passive link which has a first end pivotably and is connected to the transverse link. A lever is connected to the transverse link so as to pivot the transverse link. At least one insertion is connected to a second end of the at least one passive link, the pivotal end of the handle having a restriction port with which the insertion is disengageably inserted to restrict the handle from pivoted about the insertion.

Abstract: An exercise treadmill (20) is described having a number of assembly improvements. In one embodiment, a pivot assembly (50) is provided to allow a treadmill deck (32) to deflect during use. The rear pivot assembly includes a pin (56) transversely mounted on the upper surface of a treadmill frame (22). A pivot block (54) is attached to the deck and includes a lower channel (58) that engages the pin. In another embodiment, an adjustable rear foot assembly (70) is provided having a foot (74) that is rotatable within a mounting block (72). The foot is easily accessed through an upper opening (96) in the treadmill. In yet another embodiment, an air dam (100) is provided between a motor compartment (102) and an adjacent endless belt (28). In still another embodiment, a highly elastic drivebelt (120) is used between a motor assembly (104) and a roller assembly (24) that drives the endless belt (28). Lastly, an embodiment is described in which the treadmill frame (22) is assembled using swaged fasteners (38).

Abstract: The invention relates to a device for controlling and/or regulating a training and/or rehabilitation unit, the device comprising at least one training and/or rehabilitation unit, a sensor unit having a sensor for determining oxygen concentration and for determining carbon dioxide concentration, a control unit for the sensors, a microcontroller in the control unit for controlling the heating power of heating elements of the sensors, depending on breath flow volume, for maintaining constant sensor temperatures, and a resistance and/or braking arrangement of the training and/or rehabilitation unit that can be controlled and/or regulated based on the breath gas composition determined by the sensor unit. Said device can be used to increase endurance, preferably by means of altitude training.

Abstract: Methods, apparatus, and systems for calibrating differential air pressure systems are described. The methods, apparatus, and systems may be adapted for physical training of an individual, e.g. as a training tool to improve performance or as a physical therapy tool for rehabilitation or strengthening. The differential air pressure systems comprise a chamber for receiving at least a portion of a user's body. In one embodiment, a method for calibrating a differential air pressure system for predicting effective body weight of a user versus system pressure is described. In certain variations, the methods, apparatus and systems may comprise adjusting pressure in the system until one or more force values are reached. The methods described herein may comprise determining a relationship between body weight force and pressure, allowing the user to set a pressure or a parameter correlated with pressure to achieve a desired effective body weight.

Abstract: A treadmill test protocol is provided having a linearly increasing work rate profile achieved by linearly increasing walking speed while simultaneously and non-linearly increasing the treadmill inclination. Specifically, according to the protocol it is possible to use a test subject's projected maximum end-test work rate to calculate a treadmill test protocol that starts with a low walking speed and low grade to produce a metabolic rate that is commensurable to that of unloaded cycling in cycle ergometer tests, thereafter having a linear increase in walking speed and simultaneous curvilinear increase in treadmill grade so that when the test subject is tested according to the calculated protocol, the test result yields a work rate and metabolic rate response with a linear slope. Further, the desired maximum treadmill speed can be adjusted so as there is no need for jogging or running for any given test subject.

Abstract: A treadmill device includes two treadmills disposed above a base and each having a tread supported around a platform and each has one end rotatably supported on the base with a shaft which may be driven by a motor. An arm has a middle portion pivotally supported on the base and has two ends located below and coupled to the treadmills, for elevating one of the treadmills when the other treadmill is lowered, such that the two treadmills may be operated as a stepping exerciser. A latch may be used to lock the treadmills together.