A rocking chair provides abdominal exercise by user actuation of pivotal armrest handles that are configured to provide a crunch type exercise motion. The arrangement of internal pivot frames is such that armrest handle actuation shifts the user's center of mass both vertically and longitudinally, which in turn initiates a natural rocking motion by gravity. The inertial dynamics of the resulting motion are inherently kinesthetically pleasurable. The resistance is provided by the user's own body weight with variation through differential leverage. Alternatively, the configuration of the armrest handles is such that a user may benefit from an isometric exercise by simply holding them stationary in a conventional armrest position.

An exercise apparatus is disclosed which provides a fully operational calf building machine that can be used in diverse settings as one watches TV at home, while doing the dishes, or even while working at an office, for example. As a result, the Portable Calf Machine may benefit all individuals who seek to have a more convenient and efficient means of building their calves, at their leisure.

A waist fitness apparatus includes main body and a resilient cover. The main body has a base pivotally connected with a supporting board through an eccentric unit, and the base is used to distribute the weight of the user, so the main body can be stably disposed on the ground. The present invention is advantageous because the height of the supporting board is higher than the height of the knee height of an average adult, the user does not have to bend the knees when sitting on it to increase the comfortableness. Also, the supporting board can be dragged back to its original position by the cover when it is not in use, so the user does not have to adjust the supporting board.

A multi-functional chair includes a front leg frame, a footrest assembly connected pivotally to and extending obliquely upward from a bottom end of the front leg frame, a link rod assembly connected pivotally to the footrest assembly, a seat cushion connecting rod connected pivotally to the link rod assembly, a supporting frame connected pivotally to the seat cushion connecting rod, a seat cushion supported on the supporting frame, a backrest frame connected to and extending obliquely upward from the seat cushion connecting rod, a pivot seat connected pivotally to a top end of the backrest frame, and a backrest fixed to the pivot seat.

An upright bike includes a main frame including a front portion and a rear portion. A rail structure is connected to the rear portion of the main frame. An X-shaped frame is slidably mounted to the rail structure and pivotally connected to the front portion of the main frame. A slide end is formed on the X-shaped frame and slidably mounted onto the rail structure. A stepping structure is mounted on a lower section of the first trestle of the X-shaped frame. A seat is secured on a top of the first trestle of the X-shaped frame. A handlebar is transversally secured on the X-shaped frame. A restitute element has two opposite ends respectively secured on the first trestle and the second trestle of the X-shaped frame for providing restitution force to the X-shaped frame when the handlebar is upwardly pulled.

The invention discloses an elasticity adjusting mechanism of an exercise equipment which includes a base, a staggered frame, an adjusting socket, an elastic body and force exerting member. The base and the staggered frame pivot with each other and constitute the main structure of the elasticity adjusting mechanism of the exercise equipment. The staggered frame extends outwardly from the base and includes an extended socket and a plurality of fixed portions, the fixed portions are disposed on the staggered frame and with different distances to the extended socket. When the adjusting socket is selectively assembled with one of the fixed portions at different positions, the elastic body passing through the extended socket and the adjusting socket changes its elasticity in accordance with extension amount.

A wrist-grip exercise device is disclosed comprising two partial spheroids interconnected by an elastic central bridge, which partial spheroids may be rotatable axially 90 degrees in opposite directions around a longitudinal axis under the force, with each partial spheroid acting as a graspable handle. In some embodiments the partial spheroids are in the shape of hemispheres. The elastic bridge provides resistance to facilitate exercise and power to return the device to its original shape after being twisted and contorted during use. The elastic central bridge may be an elastomeric polymer material interconnecting the two partial spheroids. In other embodiments the central bridge is a coil spring. In some embodiments the handles are inflatable to facilitate compression grip exercises. In some embodiments the handles are attached to the coil spring by male-female connection system. Another embodiment of the present invention substitutes polyhedrons for the two partial spheroids.

An elastic structure of a sport equipment comprises a base, a staggered frame, an elastic body and an applying member. The base is supported on a ground. The elastic body is extendable and retractable located on the base. The applying member is connected to the elastic body for generating a stretching movement back and forth. The base and the staggered frame can be foldable, thus the elastic structure of the sport equipment has a smaller volume for collecting and saving.

The boxing training device is a striking machine with a pair of identical spaced apart upright members affixed to the adjustable base. A block is affixed to the uprights most proximal the top end with a head removably disposed on the block. The head can be selectively fitted with a display unit that offers electronic feedback to the user. An upper impact pad can replace the display unit. A crossbar is affixed to the double action spring hinge of the head. The crossbar has a removable impact pad on each end such that a strike on either pad causes a counterstrike from the opposite pad, as the crossbar provides resisted horizontal rotation about the head via the hinge. Various impact pads are provided and interaction is offered a user with metered measurement and recording of activity, with further interaction available for interplay with existing electronic media and devices.

A therapeutic exercise machine includes a platform having foldable legs; vertical support brackets affixed to the platform; a resistance bar assembly having a resistance bar affixed to rotation retaining plates via pivot arms; mechanical resistance devices; spring support arms; a back brace; and a knee bolster. The knee bolster is affixed to the platform. The rotation retaining plates are rotatably attached to distal ends of the vertical support brackets; First ends of the first and second mechanical resistance devices are attached to the spring support arms, and second ends of the mechanical resistance devices are attached to the rotation retaining plates. The mechanical resistance devices are arranged to resist rotation of the horizontal resistance bar about an axis of rotation defined by the distal ends of the vertical support brackets.