An exercise bar is disclosed. The exercise bar may comprise: a shaft; a first rigid handle unit rotatably connected to the shaft at a distal end of the first rigid handle unit; a second rigid handle unit rotatably connected to the shaft at a distal end of the second rigid handle unit; a grip connected to a second end of the at least one arm; and a handles lock, wherein the handles lock has an unlocked state in which each of the first and second rigid handle units is free to rotate around the shaft independent of the other, and a locked state in which the first and second rigid handle units are rotatable together and at a same direction around the shaft.

A torsion bar includes a housing and at least one inner core. The housing has a receiving space, two opposite fixing grooves defined in a sidewall of the housing and communicating with the receiving space, and a plurality of stripes positioned at an outer surface thereof. The inner core is received in the receiving space, and includes two opposite fixing elements corresponding to the fixing grooves. Each of the fixing elements includes a plurality of first protruding portions located at a side end thereof to facilitate a user to disengage from the housing, and a plurality of second protruding portions located at a surface thereof adjacent to the side end to prevent the inner core from disengaging accidently from the housing. A cross-section of the receiving space is similar to a cross-section of the inner core.

A portable exercise machine is provided for rotator cuff exercise. The portable exercise machine includes a flat board having an upper surface and a U-shaped cutout for receiving a torso of a user. A pair of opposing, rotatable arms are affixed to the upper surface of the flat board. The distal end of each arm includes a handle adapted to be grasped by a user and the proximal end of each arm is pivotally coupled to a steel coil. The steel coil provides resistance against the rotation of the distal end of the arms. The steel coil can be removably affixed to an inner connection region or an outer connection region of the flat board. The outer connection region provides resistance for inward movement of the arms and the inner connection region provides resistance for outward movement of the arms.

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.

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.

An torsion pivot device including an elastic element having an axis in a longitudinal direction is described. Two or more pivot structures may be engaged with separate portions of the elastic element along the axis to allow the pivot structures to exert torque force to the separate portions of the elastic element. An axial guide mechanism may be defined through the elastic element substantially along the axis. The pivot structures may be rotatably coupled with the elastic element via the axial guide mechanism to allow the pivot structures to pivot or rotate relative to each other around the axis. The elastic element may be deformed by the torque force via the pivoting or rotation of the pivot structures. Twisting tension may be induced by the deformed elastic element to counter the torque force.

An exercise machine including a support frame having a handle structure affixed to a base structure is described. The handle structure can provide hand support for a user using the machine. The base structure can provide floor support for the machine. One or more resilient pedaling assemblies may be pivotably coupled with the base structure to guide the exercising movements of the user. Each resilient pedaling assembly may comprise an elastic element to provide torsion force, a foot pad for user foot resting and pivot assemblies rotatably engaged with the elastic element and the foot pad. Movement of the foot pad may cause deformation of the elastic element via the resilient pedaling assemblies. The deformation can induce the torsion force from the elastic element to provide reciprocal foot pedaling effects to the user.

An exercise machine includes a main shaft having a bottom end and a top end along a longitudinal direction is described. A rotatable element may be provided at the bottom end of the main shaft. A torsion resilient assembly can include a fixed torsion structure, a pivotable structure and an elastic element. The pivotable structure can pivot to deform the elastic element to induce a resilient torque force. An engagement frame may be rotatably mounted to the pivotable structure. User force may cause the rolling of the main shaft to change an angular relationship between the engagement frame and the main shaft to cause the pivotable structure to induce a resilient torque force for user exercising.

A cable training assembly disposable within a portable housing includes a cable configured for pulling by a user and a screw mechanism configured to deflect at least one spring. The deflection of the spring exerts a retraction force on the cable in opposition to a force exerted on the cable by the user. A selector assembly includes a knob that is rotatable by the user to select or deselect a spring acting on the cable.

A cable training assembly disposable within a portable housing includes a cable configured for pulling by a user and a screw mechanism configured to deflect at least one spring. The deflection of the spring exerts a retraction force on the cable in opposition to a force exerted on the cable by the user. A selector assembly includes a knob that is rotatable by the user to select or deselect a spring acting on the cable.