A motor-less leg-powered curved treadmill produced that allows people to walk, jog, run, and sprint without making any adjustments to the treadmill other than shifting the user's center of gravity forward and backwards. A closed loop treadmill belt running between front and rear pulley rollers is formed with a low friction running surface of transverse aluminum, wooden, plastic, rubber or carbon fiber slats attached to each other in a resilient fashion. An essential feature of treadmill is the concave shape of the upper portion of the belt running surface, the treadmill configurations ensure that this shape is maintained during actual use. These configurations prevent the concave upper running surface portion from being pulled taut into a flat shape between the front and rear pulley rollers. The slats of the treadmill each have an end view crossectional I-beam shape, for strength and stability of the slat positioned upon the treadmill belt.

An exercise device featuring a pair of knee joints, each pivotally coupled to a pair of calf linkages having foot pedals at their opposite lower end that support low impact user-defined natural exercise gait patterns. The knee pivots joints are supported and directed to travel by linkage and/or carriage systems that operate substantially below the user hip area, and direct the knee pivot joints in a variety of travel paths, ranging from having a constant arc, linear pathway, to having a variety of irregular arc shaped paths, as well as, pathways that may change during use. A secondary system coupled to the knee pivot support system, provides lift and dampening forces to influence the responsiveness of the foot pedals via the bending and straightening of the calf linkage about the knee pivot joint, yet do not restrict the back and forth travel of the knee joint.

The present invention relates to a comprehensive fitness equipment leg press allows a user to do a weight training leg press exercise for training a lower body from 10 kg to 200 kg by sitting on a bench pushing the footrest included in the footrest frame, which moves back and forth smoothly along a central frame for adjusting weight of the footrest frame. The comprehensive fitness equipment leg press comprises a hydraulic cylinder formed on a lower end of the bench without using 15 10 kg weights and a hydraulic cylinder rod connection installed on a body of a weight adjusting bar using the principle of the lever for adjusting weight of the footrest of the footrest frame.

An exercise machine includes a frame, a first rotary mechanism supported on the frame, a second rotary mechanism rotatably engaging with the first rotary mechanism, and a driving mechanism operatively coupled to the second rotary mechanism and configured to impart rotation of the second rotary mechanism while the driving mechanism is being actuated. The second rotary mechanism is hubless. The second rotary mechanism is configured to absorb and retain an amount of the actuation of the driving mechanism as a moment of inertia while the second rotary mechanism rotates.

An exercise assisting device includes a table shape body configured for a user to step on, a main body which supports the table shape body from below, and a hold body which is arranged on the main body. The hold body is configured to hold a trunk of the user as the user steps on the table shape body and a center of gravity of the user is positioned more forward of a step position provided on the table shape body. The exercise assisting device is configured to move the table shape body relative to the main body and/or the hold body relative to the main body while regulating a forward inclination of the user as the user uses the device.

An elliptical trainer has a main frame having two opposite sides, each having a linking device, a stepping device and an interlocking device mounted thereon, wherein the interlocking device is provided to connect the linking device and the stepping device. A damping device is mounted on the main frame and operated with the two interlocking devices so as to promote exercise on the elliptical trainer. A longitudinal axis of an elliptical foot motion of each stepping device is adjusted due to a step force from an operator for changing a working stroke of the elliptical trainer.

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.

An exercise apparatus may provide a novel linkage assembly suitable for linking circular motion to relatively more complex, generally elliptical motion. Left and right rocker links may be rotatably mounted on a frame rotatable about a first axis. Left and right cranks may be mounted on the frame rotatable about a second axis. Left and right force receiving members may be movably connected between respective rocker links and cranks in such a manner that the force receiving members move through variable paths of motion that may change as a function of user applied force.

An elliptical trainer with variable stride includes a base frame, a swing unit axially mounted at the base frame, a pedal unit axially mounted at the swing unit, a damping unit for providing damping resistance to the swing unit, and a constraining unit including an axle axially mounted at the base frame, a pair of upper cranks respectively affixed to two opposite ends of the axle and a pair of coupling members respectively pivotally coupled between the upper cranks and the swing unit. Mating the constraining unit with the swing unit prevents the swing unit from overswinging, enhancing user safety.

An elliptical trainer includes a base frame, a swing unit axially mounted at the base frame, a pedal unit axially mounted at the swing unit, a damping unit for providing a damping resistance to the swing unit, a guiding unit and an elastic device unit. The guiding unit includes a pair of cranks respectively connected to the damping unit and a pair of guide brackets respectively pivotally connected to the cranks. Each guide bracket includes a guide wheel slidably coupled to the base frame and a bearing member for supporting one respective stepping bar. The elastic potential energy of the elastic device set constantly keeps the rear end portions of the stepping bars in proximity to the base frame and the stepping bars in abutment against the bearing members. The matching arrangement of the guiding unit and the base frame achieves high operating smoothness and supporting stability.