Abstract: The present invention is a way to exercise the face and neck by choosing a resistance strength by a user by locating a at least one dot on a tension adjuster barrel or lining up at least two orifices. The user will place end cups of the face and neck exercise device securely into both corners of an open mouth of the user. The user will press upper and lower lips smoothly over teeth of the user and attempt to close a mouth of the user.

Abstract: rotating and tension bar exerciser in which it's movements are controlled by a 360 degree rotating bearing section which connects rotating balls and spindles to each handle of the bar. Using the rotation of the exerciser will causes the body to rotate in ways which otherwise could not be obtained.

Abstract: A finger and hand exerciser includes a housing defining four chambers arranged side-by-side in parallel with one another. Each chamber receives a tension adjustment member, a plunger that is reciprocatingly slidable in the chamber, and a helically wound compression spring extending between the plunger and the tension adjustment member. Each tension adjustment member includes a knurled wheel which the user of the finger and hand exerciser may turn to decrease or increase the force the spring exerts on the plunger.

Abstract: A device for the exercise of the musculature of the upper arm, the device comprising: telescopically assembled co operating inner and outer tubular elements, each said tubular elements having end closure means at their outer ends. The outer tubular element includes an inwardly projecting collar at its inward open end and the inner tubular element is provided with an outwardly projecting collar at its inward open end. The collars co operate to prevent the withdrawal of the inner tubular element from the outer tubular element when the tubular elements operate telescopically. The device is moveable between a first state in which the telescopic elements are fully extended and a second state in which the telescopic elements are compressible against a bias inside the device to provide a resistance force to rotational movement about the elbow of a forearm in a direction towards an upper arm of the same arm of a user.

Abstract: An exercise apparatus is described herein. The exercise apparatus can have a body forming a first yoke. The first yoke includes a first longitudinal channel extending therethrough and a first slide member is positioned in the first channel. The first slide member is slidable therein in a reciprocating manner and has an abdominal engagement end extending from the channel. The exercise apparatus can further include a second yoke pivotally attached to the body and has a second longitudinal channel extending therethrough. A second slide member is positioned in the second channel and is slidable therein in a reciprocating manner. The second slide member has an upper body engagement end extending from the second channel. The exercise apparatus can include a vibration unit operable to cause all or portions of the exercise apparatus to vibrate.

Abstract: An exercising apparatus designed to fit around a seat is provided. The exercising apparatus includes a frame that is adapted to be secured to the support. The frame is a U-shaped configuration with a lateral open area to receive the seat into the frame. One or more arms are coupled to the frame about one or more pivots. Further, the pivots allow a pivotal motion of each of the arms when a force is exerted thereto by a user. One or more first resistance devices coupled to the frame and the arms, which provide resistance to the pivotal motion of each of the arms.

Abstract: An exercise device includes a cylindrical housing closed at one end and having a spring arranged therein. A plunger is connected with the housing and abuts against the spring. The plunger is adapted to reciprocate within the housing against the force of the spring. More particularly, the plunger includes a handle exterior of the housing which is grasped by the user. The closed end of the housing includes a pad which is placed against the chest of the user. The user grips the handle and displaces the plunger against the force of the spring to exercise the biceps muscle.

Abstract: An exercise system includes at least a first and second pivot pole assembly for supporting and stabilizing a person engaged in exercise. The pivot pole assemblies each include a base plate which is configured to rest on a floor during the use of the system, and a pole portion which is pivotally connected to the base portion by a universal joint. The assemblies may be configured so as to be connectable to one another, and such connection may be achieved through the bases and/or the poles. The system may incorporate weights attachable to the poles and/or may utilize compressible poles to provide an enhanced effect. Further disclosed are exercise programs incorporating the systems.

Abstract: A dual purpose physical rehabilitation orthopedic and physical fitness exercise device for use within physical therapy facilities. The rehabilitation and exercise device includes a frame hosting a hydraulic or pneumatic system means for applying variable levels of resistance for specified exercise regimens; an activating assembly including a torsion bar, indexed platen, exercise arm assembly and a lever to act against hydraulic/pneumatic pressurized cylinders. The exercise arm assembly includes equally spaced ports and locking pins to allow altering the active length of the arm. Further, the platen contains ports, radially positioned around its facial surface to permit adjusting the angular displacement of the exercise arm through 90° either side of the horizontal. The platen also has inscribed degree indexes to define angular displacement from preset azimuth during the exercise routine.

Abstract: A thigh exerciser includes a pair of horizontal first and second swing rods each having a pivot end portion connected pivotally to the seat member, and a thigh-engaging portion disposed outwardly of the seat member. The thigh-engaging portions of the first and second swing rods can be pressed toward each other. A biasing damper includes a piston disposed within an inner chamber in the pivot end portion of the first swing rod, a fluid filled within the inner chamber, and a resilient member for biasing the piston to move within the inner chamber in a first direction. The piston is connected to the pivot end portion of the second swing rod such that pivoting movement of the first and second swing rods toward each other is converted into movement of the piston within the inner chamber in a second direction opposite to the first direction.

Abstract: An apparatus for stretching and strengthening muscles from a standing or seated position with a support member having a top end and a bottom end, the top end providing a location for grasping, the bottom end providing a base surface for force distribution and support. A preferred embodiment includes the support member which is adjustable in length such that the distance between the top end and the bottom end is adjustable. A preferred embodiment includes a way for fixedly securing the adjustable support member at desired lengths.

Abstract: A facial and neck muscle exercising device for positioning against opposite corners of a person's mouth at the opening thereof to strengthen and tone facial and neck muscles. The exercising device includes a pair of mouth spreading arms each having an elongate slide member and an end member contoured to engage the opposite corners of the person's mouth. The slide members are slidably connected together longitudinally and an arm retaining device connected thereto controls sliding movement and resistance of the mouth spreading arms. Versions of the arm retaining device elastically bias the end members against the corners of the person's mouth in an adjustable manner, allow adjustment of the length or range of motion of the exercising device, retain the exercising device at a fixed length, or a combination thereof.

Abstract: An oral exercise device that is portable, that has adjustable resistance and that allows the tongue to perform isotonic exercises in an environment that closely approximates the natural configuration of the tongue and the mouth to improve disorders of speech and swallowing.

Abstract: An exercise apparatus comprises a frame having a base and an apex. A least one pivot is connected to the frame for supporting a swinging arm. The opposite end of the arm supports a seat for an exercising athlete, and optional weights. The frame supports a force plate opposed to the seat. The seat and the force plate are connected by elastic members, such as bands, that bias the seat toward the force plate. The athlete develops reversal strength by extending his legs to bound from the force plate, then stopping the resulting forward motion at a predetermined joint position before rebounding again.

Abstract: An exerciser includes a safety block having two through holes defined through the safety block and two cutouts defined in two opposite sides of the safety block, two elastic strings respectively extending through and securely received the two through holes of the safety block, two safety pads each provided to opposite sides of the safety block to securely connect to one end of the two elastic to allow an operator to work on thigh muscles and two rings connected to a corresponding one of the two safety pads to allow the operator to work on chest muscles.

Abstract: There is now provided an expander type exercise device for performing physical workout exercise that can be configured in a simple manner to adjust the resiliency of an elastic strand for various physical workout exercises, by varying the length of the elastic strand that is disposed between two handgrips by means of which the elastic strand can be expanded by exerting a force of pull upon the elastic strand.

Abstract: A reciprocating exercise apparatus with a tube that has a slidable weight. The sliding action of the weight is damped by coil springs. To increase the types of exercises that can be performed with the apparatus there is a pair of stationary handles at the ends of the tube and a pair of handles that slide along the length of tube. The slidable handles are seated on sleeves with a swaged end. This configuration allows for exercises where the weight reciprocates alternately compressing one spring or the other and that can be performed with one hand or two. Auxiliary weights can be attached so a single unit is suitable for users with varying degrees of strength.

Abstract: Exercise system comprised of plurality of modular components enabling numerous types of exercises. Resistive force provided by durable elastomeric tubing that is quickly connectable to and disconnectable from more rigid components. A configuration of the exercise system uses a back pad and a padded plate from which extends a guide rod and spring to present an abdominal exercise option to the user.

Abstract: An exercising device includes a main body, two handles, a support rod, a resting board, a connecting lever, and a rotation body. The main body includes two casings, a slide, and an elastic member. The rotation body includes a pivot ring secured on the connecting lever, a first disk rotatably mounted on the pivot ring, a second disk rotatably mounted on the pivot ring and combined with the first disk so that the pivot ring is located between the first disk and the second disk, and a counterweight mounted between the first disk and the second disk to rotate therewith. Thus, the exercising device is used to exercise a user's arms, waist and abdomen simultaneously.

Abstract: A combined exerciser and therapist table (1) having an exercise pad (2) on rollers (4) on roller tracks (5) supported by an exerciser frame (6) on legs (7) that include height adjustment. The exerciser frame is rectangular with a head end (8) and a foot end (9). The exercise pad includes a torso portion (10) proximate the head end and a leg portion (11) proximate the foot end of the exerciser frame. A vertically oriented foot-end frame (14) is attached detachably to tops of the legs at the foot end. The foot-leg frame includes a 1 plurality of strap hooks (15, 26) that are oppositely disposed for supporting a leg strap (16, 30) at desired spaced-apart distances above the foot end. A horizontal pressure bar (17) pivots downwardly to a desired position above the exercise pad and is pivotal vertically to a non-interference position parallel the upstanding foot frame.

Abstract: A flexible main member of tubular shape is provided with handgrips at its end segments enabling the user to exercise certain muscles by repeated manual flexing of the tube. The tube is of a fiber reinforced synthetic material. A cushion is affixed medially of the tube for contact with the user's body during use of the device.

Abstract: A gymnastics springboard with adjustable elasticity comprising a top board coated with a coating subdivided into two distinct zones enabling the impact zone to be demarcated visually, which presents a homogeneous and flexible structure with a hardness able to be adjusted by means of:

Abstract: An abdominal exercise device includes a frame, and upper and lower force receiving members movably mounted on the frame and constrained to move in opposite directions. A resistance device is interconnected between the frame and at least one of the force receiving members to resist movement of the members toward one another and/or to bias the members away from one another. The lower member is configured to support a person's feet, and the upper member is configured to support a person's hands and/or to engage a person's chest. The device facilitates a combination crunch and leg lift exercise that involves both a person's upper abdominal muscles and a person's lower abdominal muscles. Also, the upper member may be resiliently supported in a manner that facilitates exercise of a person's oblique muscles, as well.

Abstract: The Upper Body Push Pull Exerciser having a Stationary Handle Croup (4), a Rotating Moving Handle, Group (3), and a Tubular Housing Grip Handle (2), allows for a variety of push pull exercises by resistance created by force against the Push Action Spring (6) or the Pull Action Spring (5), The manner of using the push pull exerciser is to use one of the alternative gripping methods and push or pull accordingly. Method 1, user grips handles (3a, 4a) and performs a variety of push or pull exercises using a wide grip. Method 2, user grips handles (2, 3a) and performs a variety of push or pull exercises using a narrow grip with one hand vertical and one hand horizontal. Using both methods allows user to thoroughly exercise more muscles efficiently as opposed to using just one Method. Different springs may be used for varied resistance levels, Handles may be different sizes, shapes, and of different materials.

Abstract: An exercising machine for developing multiple muscle groups by combining two distinct exercise elements into a single attenuated movement. The device includes multiple support housings each with upstanding handgrips extending therefrom. Each handgrip has spring resistant elements interconnected with said housings allowing for axial opposing resistant rotation.

Abstract: A demountable multi-purpose exercise device including a pair of elongate plunger members, a central guide member having a pair of oppositely disposed portions for demountable telescopic engagement with the pair of elongate plunger members. Further included is a depressible resilient means disposed between the pair of elongate plunger members and the central guide member, operative to permit mutual contraction of the plunger members in response to opposing axial forces applied thereto. There is an elongate flexible member longitudinally looped about the exercise device in engagement with the pair of elongate plunger members. Further, there are included, for use with the exercise device an exercise apparatus comprising retractable spool or drum members in cylindrical casings and elongate flexible members fixably attached and resiliently coiled about the spool members to be uncoiled in response to a force applied thereto.

Abstract: A demountable multi-purpose exercise device including a pair of elongate plunger members, a central guide member having a pair of oppositely disposed portions for demountable telescopic engagement with the pair of elongate plunger members. Further included is a depressible resilient means disposed between the pair of elongate plunger members and the central guide member, operative to permit mutual contraction of the plunger members in response to opposing axial forces applied thereto. There is an elongate flexible member longitudinally looped about the exercise device in engagement with the pair of elongate plunger members. Further, there are included, for use with the exercise device an exercise apparatus comprising retractable spool members in cylindrical casings and elongate flexible members fixably attached and resiliently coiled about the spool members to be uncoiled in response to a force applied thereto.

Abstract: An exercise machine includes a first elongated housing having an endcap at a first end and a hollow interior portion. A second elongated housing is slidably positionable within the first elongated housing. A spring having a progressive resistance force is positioned within an interior portion of the first elongated housing between the endcap and an end of the second elongated housing. The spring is compressible between the endcap and the end of the second elongated housing and provides a progressive in-line resistance to achieve a contractive motion from a semi contracted or hyper extended position from both push and pull positions.

Abstract: A lower-body exercising device and method including a three-dimensional platform with a resilient means for providing a resistance-based workout while sitting at work, home or traveling is disclosed. Preferably, the invention is manufactured from a single piece of material, is designed to be wedge-like in shape, is compact in size so as to fit under a desk or table or airplane seat, and is constructed with springs or filled bladders that provides resistance to a pushing force by the user during manipulation. The invention can be manipulated by pressing the soles of the feet alternately into the device, or together in a “pumping” motion. Optionally, the device is covered in a plush, washable upholstery material, has textured surfaces, and/or includes heating elements.

Abstract: An exercise device is held in first one hand and then in the other hand, while the second hand is exercised by screwing nuts in on threaded rods against a spring resistance. Both right hand and left hand threads are provided so that exercise of clockwise and counterclockwise motions are required. The nuts have different outside diameters so that the gripping of the nuts will be at different positions to enhance the experience. Also provided are springs of different tensions to adjust the resistance to rotation.

Abstract: The present invention relates to a device for obtaining a predetermined linear force, including a first elastic force means (Ee 1, 56) and a force output means (16, 76) in the form of a non-elastic, flexible elongated member. The invention is characterised by a force transformation means (10, 12, 72) arranged between said first elastic force means and the force output means, such that a pulling of the force output means creates a tension in said first elastic force means, and wherein the force transformation means is arranged and designed such that the pulling force required on the force output means decreases with the distance (X2) the force output means is pulled.

Abstract: A rhythmic motion driver having a case containing flywheels and a guide along which the flywheels move linearly while rotating. A spring is within the case that compresses and expands in response to oscillatory motion of a bar that extends through an opening in the case. The spring compression and expansion is slowed but not dampened by the movement of the flywheels.

Abstract: An exercising machine wherein a cable pull is resisted by spring deflection. The cable is connected to a lift arm that is pivotally fixed and carries a lift roller. The lift roller abuts a pivotally mounted bar and urges pivotal movement of the bar opposed by a spring member. The connection of the cable to the pivotal lift arm, the position of the lift roller relative to the lift arm pivot, the engagement of the roller with the pivotal bar and the engagement of the spring member with the pivotal bar all involving lever advantages that can be manipulated to achieve varying shapes of resistance of the cable pull as felt by the user.

Abstract: A portable exercise device has a base with a pair of contact surfaces suitable to receive the feet of a user, and first and second retracting cables connected to the base. First and second independent springs are biased to retract the cables onto the respective take-up reels. A user-variable, common resistance mechanism includes two brake drums connected to associated take-up reels by one-way clutch mechanisms. Methods of using the device are also disclosed.

Abstract: A U shaped spring designed to accommodate a long resistance path, designed to provide for a large leg squeezing area so that large squeezing resistance may be applied without excessive inner leg pressure, designed to facilitate incremental and great increases of resistance and, designed to employ an arm restraint so that initial movement through the first half of the range of movement will be against substantial and beneficial resistance. The U shaped spring for strengthening the pubococeygeus muscle when squeezed between the upper legs comprises: a resilient strip bent into and held in a U shape, said U shape having spaced opposite arms extending in a same direction, and a central portion connecting the opposite arms; and, an arm restraint extending between the spaced opposite arms holding and preventing the arms from resiliently springing apart beyond their spaced configuration.

Abstract: The invention provides a hand-wrestling training device, comprising an elongated main base carrying at one of its ends a mounting means to which one end of a spring means is hingedly articulated; at least one mounting plate fixedly attached to the main base near the other end of the base; a head unit pivotably mounted in the mounting plate; a pusher arm fixedly attached at one of its ends to the head unit and provided with a plate element at the other one of its ends; a body movable in translation along the pusher arm, the second end of the spring means being articulated to the body; adjustment means for altering the mechanical advantage afforded to the user by moving the body along the pusher arm, thereby altering the effective length of the pusher arm, and a gripping handle hingedly attached to a portion of the head unit; the gripping handle, when turned downward, causing the pusher arm to be applied against the opposing force of the spring.

Abstract: A resistance device for a physical exerciser includes a cylindrical housing formed with two diagonally opposite chambers at two opposite sides thereof, a fastener fixedly mounted on an inner side thereof, and a groove formed on an inner side thereof and arranged under the fastener, a pair of actuating rods inserted into a respective one of the chambers and provided with a hook and connected with a spring by a pin, an upper end of the spring being connected with the fastener, a pair of buttons pivotally connected with a top of the cylindrical housing, a tubular axle fitted within the cylindrical housing and provided with a first set of teeth and a second set of teeth which are positioned together beside each other and operate in opposite circular direction, an axle formed with a spiral groove extending through an outer surface thereof, a core member fitted within the tubular axle and having a radial hole aligned with the spiral groove, a pin inserted through the spiral groove so that a lower portion of the pin

Abstract: A facial muscle exercising device has flared and weighted lip-engaging members biased apart by a compressed coil spring. The lip-engaging members include exposed ends that extend longitudinally outwardly away from the user's face and which have a sufficient weight that the user's cheek muscles are required to overcome the gravitational force acting on the outwardly projecting ends of the device. The facial muscle exercising device also has inner ends that project into the mouth cavity, and which are flared transversely outwardly to follow the contour of and contact the inner cheek surfaces of the user's mouth. Preferably, the exposed outwardly projecting ends have removable weights so that the gravitational force to be overcome can be varied to the extent desired by the user. The removable weights may be stainless steel desks that are held in seats formed in the distal extremities of the outwardly projecting ends of the facial muscle exercising device.

Abstract: A facial muscle exercising device is designed for insertion between the lips of a person's mouth. The facial muscle exercising device is comprised of a pair of lip-engaging members disposed in longitudinal separation from each other. Each of these lip-engaging members has a convex outwardly curved side with a concave groove defined therein. A pair of the elongated, coaxially aligned telescopically engaged spreader members are urged apart by an axially compressible coil spring having opposing ends and disposed in coaxial alignment with the telescoping spreader members. A guide rod is provided and is anchored to one of the lip-engaging members. The free end of the guide rod extends through a guide passage in the other lip-engaging member. The guide rod is aligned parallel to the coaxial, telescoping spreader members.

Abstract: An adjustable spring rate pogo stick that incorporates two springs, with different spring rates, in parallel. This two-spring system can produce three different spring rates by allowing the user to engage one spring (first setting), the other spring (second setting) or both springs simultaneously (third setting). This pogo stick will accommodate weights of below 80 pounds to above 250 pounds.

Abstract: A leg exerciser for the wheelchair bound includes a frame which is placed on the floor. The portions of the frame which touch the floor may be covered with protective material. The frame has a vertical bracket at one end thereof formed as a rectangle about an open interior. This bracket is mounted between the small front wheels and the larger main wheels of a wheelchair. A portion of each of the front wheels is securely retained in the bracket's open interior. This arrangement thus serves to fix the position of the wheelchair relative to the exerciser and to prevent relative movement between the wheelchair and the exerciser. The forces exerted on the exerciser are directed so that the front wheels of the chair are caused to engage the bracket which prevents the rearward movement of the chair and any forward movement of the exerciser. Two shock absorbers provide resistance against radius arms to which foot pedals are attached.

Abstract: An exerciser includes two elongated barrel members, two force-bearing members, two elastic units, and a barrel-connecting member. Each barrel member is formed with an insert hole, a longitudinally extending slide channel, a longitudinal slit that extends parallel to and that permits access to the slide channel, and an anchoring block disposed adjacent to one end of the slide channel. Each force-bearing member has a slidable block portion disposed in and slidable along the slide channel of a respective barrel member, and a force-bearing portion extending laterally from the slidable block portion and out of the slide channel of the respective barrel member via the longitudinal slit. Each elastic unit is disposed in the slide channel of a respective barrel member, and has one end connected to the anchoring block of the respective barrel member, and an opposite end connected to the slidable block portion that is disposed in the slide channel of the respective barrel member.

Abstract: A chin and neck exercising device made from foam and which may be in the shape of a ball is disclosed. One half of the ball may be made from one type of foam and the other half of the ball may be made from another type of foam. In this way, different resistance is provided to the person using the device. The device also has a side which is cut-out so that the device is contoured to fit under the person's chin and rest on his or her neck and clavicle. The cut-out area is covered with fabric so as to provide a better grip and to prevent perspiration from contacting the ball. Various exercises may performed by the person in order to tone and strengthen his or her chin and neck muscles. While the device has been described as being formed in the shape of a ball, other sizes and shapes may be used. In an alternative embodiment, the exerciser may include a vibrator located therein.

Abstract: A Portable General Purpose Exercise Device which functions as a small, lightweight, inexpensive exercise device for use by a human being. This device comprises an inner section of handles which is allowed to slide along an outer section of handles. The two sections of handles are predetermined to be shaped and or otherwise configured for gripping and engaging human body parts. A stretchable means for resistance is interconnected between the two handle sections. When the exerciser moves the handle sections relative to one another both pushing and pulling exercises can be preformed on the same unit by varying the choice of handles gripped and the direction of the force exerted on the chosen handle. This allows the many different sized and configured muscle groups in the human body to be exercised.

Abstract: A strength training apparatus is for strengthening the body muscles, and includes a housing; at least one compression spring element which includes a housing; at least one compression spring element which is placed in the housing and which is acted upon by muscular force of the body muscles. There is a lever mounted in the housing, and this lever has a power arm end around which an outwardly extending pulling loop is engaged. This lever has a work arm end pressing against the compression spring element.

Abstract: An exercise device comprising two guide members each including an elongated guide track, two handles each including a body slidably mounted to the guide track of one of the two corresponding guide members, and multiple elastic ropes each having a first end secured to the guide track of one of the corresponding guide members, and the second end secured to the body of one of the corresponding handles to move therewith.

Abstract: A muscle strengthening apparatus comprising a first elongate member, a second elongate member, a feet securing member and a support member. The first and second elongate members have a pair of end portions. The feet securing member secures the feet of a user and is attached to an end of the first elongate member. The other end of the first elongate member has an engagement portion. The second elongate member is slidably engaged with the first elongate member. The axes of the first and second elongate members are substantially coaxial and the movement of the first and second elongate members is substantially linear. The apparatus further comprises a system for exerting a force on the first and second elongate members so as to urge the first and second elongate members in opposite directions. The support member is configured to contact the buttocks of the user and is attached to the other end of the second elongate portion.

Abstract: A hand stretching method and apparatus mimics a well known exercise to reduce the problems with repetitive stress injury. A body of resiliently deformable material has flat and parallel top and bottom surfaces, with a cutout at one edge of the body. A user's hand is placed on the body, with the palm of the hand spanning the cutout. By pushing down on the hand, the opposite sides of the palm are urged apart, opening the carpal tunnel and relieving compression on the blood vessels and nerves. A user may place one hand on each surface of the body and urge the hands towards each other for treatment of both hands simultaneously. The body is preferably made of an expanded polymeric material such as polyurethane. Layers having different compression factors may be utilized; and, darker colored surface layers of material may be adhered to the top and bottom surfaces so the surfaces will not readily show dirt.

Abstract: An exercise device comprises first and second members connected together by spring means so as to be movable towards each other by the application of a compressive force therebetween or to be movable away from each other by the application of a tensile force to said members. A sounder is provided on one member which, on contact with a striker surface on the other member, emits a warning sound. The striker surface is adjustable towards and away from said sounder so that the warning sound is emitted when a selected predetermined force is applied to the members.

Abstract: A chin and neck exercising device made from foam and which may be in the shape of a ball is disclosed. One half of the ball may be made from one type of foam and the other half of the ball may be made from another type of foam. In this way, different resistance is provided to the person using the device. The device also has a side which is cut-out so that the device is contoured to fit under the person's chin and rest on his or her neck and clavicle. The cut-out area is covered with fabric so as to provide a better grip and to prevent perspiration from contacting the ball. Various exercises may performed by the person in order to tone and strengthen his or her chin and neck muscles. While the device has been described as being formed in the shape of a ball, other sizes and shapes may be used.