Abstract: An adjustable barbell or dumbbell or exercise device includes a handle having two end members, two carriers attached to the end members of the handle respectively, and a weight member having one or more latch members for detachably attaching to the end member of the handle, and a lock member slidably attached to the weight member and having a tongue for engaging with the carrier and for locking the weight member to the handle when the latch members of the weight member are rotated relative to the carrier, the other weight members are attachable to the weight member with the other latch members and the other lock member without supporting the weight members in a supporting base.

Abstract: An exercise device for the pubococcygeus muscle of a male person comprising: a support member having two arms and a base; wherein the arms of support member are configurable to fit around the shaft of the penis of a male person so that the base depends from the penis.

Abstract: A method to exercise the muscles acting on the thoracolumbar fascia of an individual utilizes a manually held apparatus which is manipulated to roll a ball in the apparatus to change continuously the balance of the apparatus to destabilize muscles in the body of an individual utilizing the apparatus.

Abstract: A training and exercise device is provided to aid in proper positioning, technique, and muscle memory for different sports and exercise related activities. The training device includes a cylindrical barrel member. A sled or sleds are connected to the barrel member such that rotation and movement of the barrel member will in turn move the sled or sleds. The sleds are bi-directional such that they are able to move in both forward and rear directions, which will allow the training device to be used in multiple directions without having to reorient the entire device between exercises. The barrel device, sled or sleds may also be configured to adjust the weights thereof to increase or decrease the resistance of the movement of the training device to accommodate for different user's size, abilities, and intended outcome.

Abstract: An exercise device and a method of exercising includes one or more undulation members, such as ropes, which a user undulates, which may cause an elastic line to stretch and/or a travel line to travel around one or more pulleys. The exercise device is configured to allow exercise using undulation members in a relatively small space.

Abstract: A weight training device comprising a hollow tubular body. A plurality of handle wells disposed in the hollow tubular body. A plurality of handles disposed in the handle wells, wherein the plurality of handles comprise axially-oriented handles and circumferentially-oriented handles, and wherein the axially-oriented handles are diametrically opposed to the circumferentially-oriented handles. A fill cap well disposed in the hollow tubular body. A fill cap disposed in the fill cap well and removably attached to the hollow tubular body, wherein the fill cap is threaded and is attached to a threaded extrusion of the hollow tubular body. A plurality of baffles disposed within the hollow tubular body, wherein the hollow tubular body is configured to be used partially filled with a fill material so as to create a randomly variable weight distribution. Two diametrically-opposed end caps are attached to the axial ends of the hollow tubular body.

Abstract: A portable exercise device includes a main body, a driving device, at least one transmission member, at least two straps and at least two assembling members. The main body has an inner space, the inner space has a containment space, and a limiting slot and an opening are respectively disposed on a bottom portion and a sidewall of opposite sides of the main body. The driving device is a motor disposed in the containment space, the driving device connected to an eccentric member and a driving shaft. The transmission member includes a longitudinal slot and an extension arm disposed adjacent to each of two sides of the longitudinal slot, the transmission member disposed in the inner space of the main body, the eccentric member inserted through the longitudinal slot, and front and rear sidewalls of the main body are configured to position the transmission member.

Abstract: An abdominal exercise equipment is provided with two front wheels and two rear wheels to ensure that the abdominal exercise equipment can move stably without tipping over during movement, preventing the exerciser from losing balance and getting hurt. A return gear assembly is disposed between the two rear wheels to produce a recovering force. Therefore, when the abdominal exercise equipment is pulled back, the recovering force will assist the exerciser to pull the abdominal exercise equipment back, which consequently lowers the difficult level of exercise. Furthermore, the abdominal exercise equipment is provided with a vibration device which is capable of softening the muscles and fat, and speeding up fat loss by producing vibration.

Abstract: The nature of this invention is that it is an exercise ring and accessory wand that is twirled by the wrist, ankle or with wand to strengthen various body parts. The ring weighs one to twenty pounds, has an inside diameter of 8-18 inches, an outside diameter of 10-20 inches and is one to two inches thick depending on design and materials. The wand has two knobs for retaining the ring as it is twirled by hand and is one inch thick and 12 to 18 inches long.

Abstract: An inertial dumbbell exercise device including a first and second weight assembly disposed endwise upon a handle, each of said weight assemblies including a rod disposed perpendicularly and slidably upon the handle, an interchangeable pair of weights disposed endwise upon said rod, and an interchangeable rubber sleeve disposed between each of said pair of weights and said handle, wherein movement of the handle in a first direction accelerates one of said pair of weights from a first position to a second position against the elastic force of the respective rubber sleeve, movement of the handle in a second and opposite direction accelerates the other of said pair of weights from a first position to a second position against the elastic force of the respective rubber sleeve, and the compressive resistance of the rubber sleeve is adjustable, as desired.

Abstract: A resistance system, which can be suitable for incorporation in exercise equipment, is a “hybrid” resistance assembly having at least a first and a second resistance unit. The first resistance unit can be of a first type and the second resistance unit can be of a second type. The first resistance unit can be an inertial resistance unit, which incorporates an inertial load that creates resistance influenced by the inertia of a movable mass, such as a rotatable flywheel. The second resistance unit can be a static or non-inertial resistance unit, such as a displacement resistance unit, which incorporates a load that creates resistance influenced by displacement (e.g., linear or rotational displacement) of an input to the displacement resistance unit.

Abstract: An exercise device is disclosed that provides users with a way to effectively exercise their core muscles without going to a gym. The exercise device comprises a round tube, a pair of handles secured to the round tube, and at least one sphere inserted into the round tube, wherein a user rotates the exercise device in a circular motion causing the sphere to travel around the round tube. The round tube comprises an interior cavity with an internal track system for the spheres to travel. Typically, the spheres are weighted, and the exercise device comprises a plurality of spheres each of a different weight. Furthermore, the round tube can comprise an access panel positioned on the exterior surface of the round tube for inserting a sphere, and a pair of handles that span an inner diameter of the round tube and are secured to opposing sides of the round tube.

Abstract: A gyration type exercising device includes a gyration unit (10), a damper (20) and a drive handle (30). The gyration unit includes a mounting frame (11) and a rotation wheel (12) rotatably mounted on the mounting frame and driven by the drive handle. The rotation wheel is provided with a rotation shaft (121). The drive handle has a first end pivotally connected with the rotation wheel and a second end provided with a holding bar (31). Thus, when the user's two hands hold the holding bar to move the drive handle in a gyration manner, the user's body has to move forward and backward and has to exert a force on the drive handle successively to rotate the rotation wheel reciprocally so as to exercise the user's body completely.

Abstract: An inertial exercise device includes a hollow outer ball and a weighted inner ball elastically suspended inside the outer ball by at least two opposing suspension members. The weighted inner ball may contain a fluid mass. The hollow outer ball, the weighted inner ball and the at least two opposing suspension members may all be integrally formed with each other. In one embodiment, the outer ball, the inner ball, and the suspension members are all formed from integral segments of a pliant tube. The hollow outer ball is formed by everting first and second end segments of the tube over the middle segment of the tube and joining the first and second end segments of the tube together at their openings. The weighted inner ball is formed from the middle segment of the tube which, in one embodiment, is a bulge in the tube.

Abstract: A gyroscopic exerciser starting dock has a starter dock housing and a starter dock axle mounted within the starter dock housing. A driving wheel is mounted to the starter dock axle. A retractable pull cord grip sleeve device is mounted to the starter dock axle and has a pull handle attached to a pull cord. The pull handle is for pulling the pull cord, and the pull cord is attached to the handle at a pull cord first end. A spool receives around it a pull cord and a pull cord is attached to the spool at a pull cord second end. The spool member receives and stores the pull cord in a coil around the spool.

Abstract: A flexible exercise device includes a resilient portion connected between a handle and an excitation mass. The resilient member is tuned such that the spring rate of the resilient portion, in combination with the excitation mass, cooperate to provide a natural frequency that is below a user excitation frequency. The flexible exercise device provides a force feedback input into targeted muscle groups that influence a swing speed of a sports implement, such as a baseball bat.

Abstract: A trampoline-type device comprises an encompassing frame supported by plural legs and a mat suspended on the frame. The frame is supported by no less than three legs. Support members attachable to the frame convert the device into a plyometric rebounder.

Abstract: An exercise apparatus used for exercise and more specifically musculoskeletal physical therapy and rehabilitation purposes. The exercise apparatus particularly, but not exclusively, uses a combination of weight, a structure adapted for weight training by a person, and a means to suspend the weight wherein the suspended weight is adapted to have motion in the x, y and z axis during an exercise movement that results in increased joint strength and decreased joint pain during and after physical therapy and rehabilitation exercises.

Abstract: An exercise device is disclosed having a main body including a chamber formed therein and a pair of spaced apart outer hubs disposed thereon. The main body is configured to be grasped by a user. The exercise device may also include at least one containment article having a chamber formed therein and extending between the outer hubs. A displaceable component may be disposed in the chamber of at least one of the main body and the at least one containment article to provide a selected total weight to the exercise device.

Abstract: A dynamic weight training apparatus is disclosed herein for improved calorie burning and muscle toning. The weight training apparatus generally includes a pendulum mass suspended, e.g., via a flexible shaft, from a handle or other securing mechanism. A user swings the weight in a pendulum motion when exercising (walking, jogging, stationary, sitting or standing) providing for increased resistance. A flexible shaft may advantageously dampen/reduce shock and strain associated with the pendulum motion.

Abstract: A hemispherical grip member has an outer hemispherical surface and a grip layer and a grip member opening. A length of aircraft cable having a first cable end extends through the opening and is crimped in position onto the grip member with a cable nut. A connector is provided on an opposite cable end. A length of a soft flexible tubing surrounds the cable between the grip member and the connector. When a user grasps the hemispherical surface of the grip member, the first cable end is located inside the grasp of the user and the cable and tubing passes between two fingers of the user.

Abstract: Embodiments of the disclosed subject matter relate to an exercise device for torso rotations. The device includes a rotating assembly including an inclined, elevated, backwardly-oriented back rest and optionally a head rest and an arm assembly. The rotating assembly is configured to a effect a side-to-side rotation around a pivot point elevated above a base of the device and around an axis oriented along the device. When the user leans weight his upper back on the back rest to elevate his/her upper back, s/he may effect torso rotations that, in some embodiments, are resisted by a resistance assembly of the exercise device.

Abstract: An exercising bar assembly includes a holding unit and two opposite swinging units each removably mounted on the holding unit. Thus, each of the two swinging units can be removed from the holding unit when not in use to reduce the whole volume of the exercising bar assembly and to facilitate storage, packaging, carrying and transportation of the exercising bar assembly.

Abstract: An inertial exercise device includes a hollow outer ball and a weighted inner ball elastically suspended inside the outer ball by at least two opposing suspension members. The weighted innerball may contain a fluid mass. The hollow outer ball, the weighted inner ball and the at least two opposing suspension members may all be integrally formed with each other. In one embodiment, the outer ball, the inner ball, and the suspension members are all formed from integral segments of a pliant tube. The hollow outer ball is formed by everting first and second end segments of the tube over the middle segment of the tube and joining the first and second end segments of the tube together at their openings. The weighted inner ball is formed from the middle segment of the tube which, in one embodiment, is a bulge in the tube.

Abstract: The invention is directed to a muscle trainer and methods for exercising opposing muscles of a person moving an implement. If the opposing muscles were of appropriate strength, the opposing muscles would apply forces in opposite directions to the implement to assist in maintaining an ideal movement of the implement. The methods train the opposing muscles to consistently move the implement in an ideal way to accomplish the function. The methods include: (a) moving the muscle trainer through an actual motion; (b) determining a difference between the actual motion and an ideal motion, the difference indicating a dominating force direction in which the dominating muscles urge the muscle trainer; (c) applying an external force to the muscle trainer to urge the muscle trainer in the dominating force direction; and (d) using the non-dominating muscles to urge the muscle trainer against the external force to thereby exercise the non-dominating muscles.

Abstract: A series of weights in various sizes and configurations, where a fluid, including but not limited to water, moves and shifts inside the hollow body or bodies of the weight, thereby providing a shifting center-of-gravity to the device during use. This shifting requires greater effort from the user to maintain stability, and results in faster and greater muscular development over a standard set of weights with a fixed center of gravity. The body may comprise any desired shape or form, such as an oval, rectangle, square, or circle, and may have rounded corners or ends in order to promote flow of the fluid or water inside the body. The body also may comprise one or more connectors extending between body parts. One or more handles may be affixed to the body.

Abstract: A wrist exerciser with a handle and multiple hold positions includes a first exercise ball body and a handle. The first exercise ball body has a first opening, a rotor, and a first hold position for driving the rotor to rotate. The first opening is disposed at a side of the first exercise ball body. The rotor is disposed inside the first exercise ball body. The handle is connected to the other side of the first exercise ball body where the first opening is disposed. The handle is coaxially corresponding to the first opening, and has a second hold position for driving the rotor to rotate, so as to provide multiple hold modes for a user to carry out wrist exercise modes of different postures, thereby increasing interests and enhancing comprehensiveness of forearm muscle exercises.

Abstract: An exercising device includes a main body having an elongate cord and a grip, and a weight unit adjustably mounted on the cord. The weight unit includes a connecting block mounted on the cord, and a weighting block mounted on the connecting block. The connecting block has a flexible tapered mounting post and has a mounting hole. The weighting block has a tapered pressing hole pressing the mounting post. Thus, the mounting hole of the connecting block encircles the cord completely so that when the mounting post is pressed toward the cord by the pressing hole of the weighting block, the connecting block compresses the cord tightly so as to lock the weight unit on the cord of the main body.

Abstract: An exercise device for generating vibration is provided. The device includes a body that is attachable to exercise equipment through a pair of attachment mechanisms coupled to the body. One of the pair of attachment mechanisms is attachable to a cable of the exercise equipment and the other of the pair of attachment mechanisms is attachable to an accessory for the exercise equipment. A vibrational assembly is positioned within the body and includes a rotatable shaft having a weight attached thereto. The rotatable shaft rotates the weight to generate vibrations in the body, wherein the vibrations in the body generate vibrations in the accessory for the exercise equipment.

Abstract: An exercising bar assembly includes a holding unit and two opposite swinging units each removably mounted on the holding unit. Thus, each of the two swinging units can be removed from the holding unit when not in use to reduce the whole volume of the exercising bar assembly and to facilitate storage, packaging, carrying and transportation of the exercising bar assembly.

Abstract: A gyroscopic exercise ball (10) includes a housing (10a, 10b) surrounding a rotor (12) centrally disposed on a shaft (14) having two ends (28) mounted in notches (26) of a freely rotatable gimbal ring (24). The ring and the ends of said shaft are disposed in a groove having a height larger than a diameter of the ends of the shaft. The diameter is larger than a thickness of the gimbal ring, and a rotation rate sensor (60) measures the rotor speed. A processor (110) is in communication with the rotation rate sensor to calculate an exercise evaluation. A pitch axis and a roll axis gyroscopic sensor (80, 70) are in communication with the processor. The exercise evaluation determines energy expenditure, force, power, angles or angular velocity of motion, range of motion, position, speed or trajectory of motion, and an evaluation of form for an individual exercise.

Abstract: Weight bars are disclosed that provide an enhanced workout. Specifically, weight bars of the present invention include a vibration mechanism that creates a vibration in the weight bar. Weight bars of the present invention can be configured to be held in one hand or in both hands. Additionally, the weight bars of the present invention can include a rechargeable power source for the vibration mechanism. While not in use, the weight bars of the present invention can rest on a base member. The base member may include a charging plug that mates with the charging port such that the power source for the vibration mechanism can recharge while resting on the base member.

Abstract: An inertial weight for physical conditioning includes a hollow housing having an inner cavity with first and second spaced apart opposed ends and defining a longitudinal axis extending therebetween. The inner cavity tapers transversely outwardly along the longitudinal axis from a mid section to each of the first and second spaced apart opposed ends. A viscous fluid mass is carried in the inner cavity, the viscous mass filling the inner cavity less than full to allow the viscous mass to move within the inner cavity. An attachment member is affixed to at last one of the opposed ends.

Abstract: A rotary dumbbell of the present invention includes a handle, and two pairs of wheels and weight devices pivoted on opposite ends of the handle for rotation. Each of the wheels has a center pivoted on the handle and is unadjustable in a radial direction thereof that the wheels centrally rotate. Each of the weight devices is adjustable in a radial direction thereof that the weight devices may eccentrically rotate. The dumbbell further includes two pairs of covers to hold the weight devices and the wheels respectively. Therefore, user may get an extra loading because of the eccentric rotation of the weight devices when he/she shakes the dumbbell. The dumbbell may be used as a roller to train abdominal muscles while the wheels serve the function of rollers.

Abstract: A dumbbell having adjustable inertial resistance load in the field of athletic sports devices is disclosed. The structure of the present invention is characterized in that the hand grip of the dumbbell is provided inside with a rotatable main shaft, the two swing hammer rods and the swing hammers at both ends of the main shaft constitute a normal pendulum, and the two pendulums at both ends of the main shaft are connected through the main shaft, so as to be functionally combined into the function of one eccentric pendulum. The main shaft, the two swing hammer shafts and the swing hammers constitute an eccentric pendulum. The two pendulums fixed at both ends of the main shaft may be adjusted at different angles. In case the angle between the two pendulums is zero degree, upon the rotation of the pendulums, the forces between the hand grip and the hand, besides the mutual force in the up-and-down direction, also include the periodic inertial force in the fore-and-aft direction.

Abstract: A shoulder and rotator cuff exercise device that includes: a circular tube; a plurality of weighted balls within the tube; a hand bar with a hand grip, where the hand bar extends across the inner diameter of the tube, said hand bar including two sliding end points; and movement control mechanisms which engage the two sliding end points and limit the radial movement of the sliding end points. The shoulder and rotator cuff exercise device also may include an opening on the inner diameter of the circular tube, where the opening allows the insertion of weighted balls into the tube. In one particular embodiment, the circular tube may include handgrips on an outer surface of the tube. The plurality of weighted balls used with the device may vary in weight and thus the composite weight of the plurality of weighted balls may vary as desired by the user.

Abstract: A barbell or dumbbell or exercise device includes a handle having two end portions, a weight member attached to either of the end portions of the handle and having a ball guiding raceway for engaging with a rolling device which is movable along the ball guiding raceway of the weight member for generating a vibration to the weight member and the handle, the weight member includes a housing attached onto the weight member and engaged with the rolling device for retaining the rolling device in the weight member, for example, the housing includes a chamber for receiving the weight member and includes a peripheral flange extended radially and inwardly into the chamber and secured to the weight member.

Abstract: A kinetic dumbbell of the present invention includes a handle and two weight devices connected to opposite ends of the handle. Each of the weight devices has an annular channel and at least a ball received in the annular channel. The balls are running in the endless annular channels to provide an extra vibration effect while training with the kinetic dumbbell of the present invention.

Abstract: A portable device for training and exercising constituted of: a shakable member; a rotational member in communication with the shakable member, the rotational member exhibiting an axis of rotation; a mass exhibiting a center of gravity in communication with the rotational member, the center of gravity of the mass offset from the axis of rotation of the respective rotational member; a motor in communication with the rotational member and arranged to rotate the rotational member about the respective axis of rotation thereof responsive to the at least one motor; and a control circuitry in communication with the motor, the control circuitry arranged to operate the motor so as to irregularly rotate the rotational member to thereby shake the shakable member.

Abstract: An exercising device includes a main body having an elongate cord and a grip, and a weight unit adjustably mounted on the cord. The weight unit includes a connecting block mounted on the cord, and a weighting block mounted on the connecting block. The connecting block has a flexible tapered mounting post and has a mounting hole. The weighting block has a tapered pressing hole pressing the mounting post. Thus, the mounting hole of the connecting block encircles the cord completely so that when the mounting post is pressed toward the cord by the pressing hole of the weighting block, the connecting block compresses the cord tightly so as to lock the weight unit on the cord of the main body.

Abstract: An adjustable inertial exercise device has an elongate member with first and second threaded portions with opposite-handed threads. First and second nuts, each having at least one radial flange, are respectively rotatably engaged with the first and second threaded portions of the elongate member. A sleeve is slidably mounted over the first and second nuts. The sleeve has an internal bore with first and second bearings and at least one longitudinal groove slidably engaged with the radial flanges of the first and second nuts. Elastic resistance elements interface between the first and second nuts and the first and second bearings. Rotation of the elongate member relative to the sleeve one direction causes the nuts to move apart from one another compress the resistance elements. Rotation of the elongate member relative to the sleeve in the opposite direction causes the nuts to move toward one another and expand the resistance elements.

Abstract: Devices such as exercise hoops are detailed. The hoops may include multiple, serially-connected sections designed to receive internal weights and configured so as to accept both differing numbers and masses of weights as desired. At least some sections, furthermore, may comprise multiple detachable pieces, with complementary pieces exposing one or more weight-receiving compartments when detached.

Abstract: A disc holder dock includes a top cover having an opening for a driving wheel. The top cover has a cradle area for docking a gyroscopic wrist exerciser. The top cover further comprises a guide vane for directional guiding of the gyroscopic wrist exerciser. The top cover has a top cover sidewall. A middle frame mounted to the top cover. The driving wheel is mounted to the middle frame. The driving wheel is connected to the middle frame by a support. A lower plate is for holding a disc. The lower plate has a lower plate upper side and a lower plate lower side. The lower plate further includes a disk storage area.

Abstract: A jump rope simulator for aerobic and anaerobic exercise having a hand-held unit comprising a handle, a base length connected to the handle, and one or more concatenated extension lengths attached to the base length. To exercise, the user grasps one or two units, imitates the motions of swinging a conventional jump rope, and jumps up and down, but there is no risk to the user of tripping over a rope as with a conventional jump rope. If the user desires, two units may also be linked together with an easily attachable connector to form a device similar to a conventional jump rope. A user can quickly convert between the two configurations of the jump rope simulator.

Abstract: A turn and burn exercise device comprising a frame assembly (including a periphery ring; and a plurality of frame rails); a rotation assembly (including at least one bushing and at least one bearing); a sphere having an inner volume; an inner surface; and an outer surface; and at least one ball. The turn and burn exercise device when operated during an exercise routine may or may not contact a ground surface. The turn and Burn exercise device allows users to burn calories and fat at relatively consistent rates throughout workout sessions. The longer the ball is in motion, the more calories and fat users may burn. The ball may also be used on the floor for push-ups and extensive core workouts. Different amounts of weight can be applied to the turn and burn exercise device as necessary to achieve desired results.

Abstract: A barbell or dumbbell or exercise device includes a handle having two end portions, a weight member attached to either of the end portions of the handle and having a ball guiding raceway for engaging with a rolling device which is movable along the ball guiding raceway of the weight member for generating a vibration to the weight member and the handle, the weight member includes a housing attached onto the weight member and engaged with the rolling device for retaining the rolling device in the weight member, for example, the housing includes a chamber for receiving the weight member and includes a peripheral flange extended radially and inwardly into the chamber and secured to the weight member.

Abstract: An oscillating inertia system for use in an exercise apparatus that provides instantaneously variable amplitude. In one example, an oscillating inertia system includes a rotational oscillator having inertial mass. The rotational oscillator is coupled to a limb engagement member through a coupling member. During operation, the oscillating inertia system is configured to rotate in one direction, come to a stop, rotate in the other direction, come to a stop, and so on repetitively. This oscillating rotation causes the limb engagement member of the exercise device to move through a range of motion where one extent of the range of motion is fixed and the other extent of the range of motion is variable in real time responsive to a user's exerted/applied force.

Abstract: A full body twisting exercise machine has a support frame comprising a lower layer portion and an upper layer portion, a bearing respectively installed at the lower and the upper layer portions, a revolving shaft disposed though both bearings, one end of the revolving shaft protruding from the upper layer portion and connected to a crank and having an extension bar, a free end of the extension bar having a connecting portion; a connecting rod, a driving rod and a handle, an aperture of the connecting rod pivoted to the connecting portion of the extension bar and secured to one end of the driving rod; another end of the driving rod connected to a handle; and a flywheel disposed between the lower layer portion and the upper layer portion and jacketing the revolving shaft, and the lower layer portion of the support frame having a damping device.

Abstract: The invention relates to a method for exercising muscles with the aid of an exercise apparatus and, where appropriate, for measuring exercise conditions, where the person exercising loads the relevant muscles by increasing or decreasing the rotational energy (E(kin)), kinetic energy, of at least one rotatably mounted flywheel, by means of a traction element which is wound up and designed for acting on the flywheel, the flywheel being braked in a controlled manner by means of a brake element. The invention also relates to an exercise apparatus for exercising muscles.

Abstract: In general, an exercise device includes a handle having a first end and a second end. A curved member is coupled to the first end of the handle. A movable member is coupled to the curved member, with the movable member configured to travel along a length of the curved member, where the movable member has a first portion and a second portion, and the second portion is configured to move relative to the first portion. An elongate member has a first end and a second end, and the first end of the elongate member is coupled to the second portion of the movable member. A weight is coupled to the second end of the elongate member.