Apparatus for back improvement and lower-back pain and knees relieving, the apparatus including, for each foot of a user, a pedal shiftable along a linear axis, for allowing a foot of the user to exert force on the pedal, a sensor, for continuously sensing a force exerted on the pedal by the foot, a linear actuator having a longitudinal bore in a piston thereof, the linear actuator being configured to move the piston away from the pedal when the force on the pedal exceeds a first threshold, and a controller for reading a sensing of the sensor, the controller being adapted to instruct the mechanism to move the piston away from the pedal such that the pedal retracts in response to pressure exerted by the foot.

An isometric, dynamic isotonic concentric and dynamic isotonic eccentric motorized guidance exercise apparatus for human muscle development is provided. The exercise apparatus comprising a frame, an electric motor, the motor including an output shaft and the motor secured to the apparatus at the frame, a drive guidance assembly, the drive guidance assembly secured to the apparatus at the frame and connected to the output shaft of the motor; at least one tactile feedback interface member, the at least one tactile feedback interface member secured to the drive guidance assembly; a resistance means, the resistance means secured to a human body, the human body positioned at the at least one tactile feedback interface member and wherein energizing the motor actuates the drive guidance assembly, the drive guidance assembly induces a motion in the at least one tactile feedback interface member, the human body engages the at least one tactile feedback interface member and the human body actuates the resistance means.

An exercise machine resistance adjustment system for providing an exerciser the ability to immediately adjust the resistance force by changing their body position on the movable carriage or end platforms. The exercise machine resistance adjustment system generally includes a frame, a carriage movably positioned on the frame, a spring connected to the carriage to apply a biasing force to the carriage, one or more left projections within the carriage adapted for a left hand of an exerciser to grasp, and one or more right projections within the carriage adapted for a right hand of an exerciser to grasp. The exerciser is able to efficiently adjust the amount of resistance force applied to the carriage by repositioning their hands (or feet) from a first set of projections at a first distance to a second set of projections at a second distance from the first end of the exercise machine.

Provided is a chest expander including a pair of operational arms having upper ends rotatably coupled to a head and moving to approach or be spaced apart from each other and a pair of gas springs disposed crosswise between the pair of operational arms. In the operational arm, a longitudinal hole configured to guide one end of the gas spring to move are formed. A guide coupled to the one end of the gas spring are arranged in the longitudinal holes. A Holding device holds the guide at a selected position. Intensity of elastic force provided by the gas spring is adjustable by adjusting a position of the one end of the gas spring.

An exercise machine resistance adjustment system for providing an exerciser the ability to immediately adjust the resistance force by changing their body position on the movable carriage or end platforms. The exercise machine resistance adjustment system generally includes a frame, a carriage movably positioned on the frame, a spring connected to the carriage to apply a biasing force to the carriage, one or more left projections within the carriage adapted for a left hand of an exerciser to grasp, and one or more right projections within the carriage adapted for a right hand of an exerciser to grasp. The exerciser is able to efficiently adjust the amount of resistance force applied to the carriage by repositioning their hands (or feet) from a first set of projections at a first distance to a second set of projections at a second distance from the first end of the exercise machine.

An exercise apparatus comprises a frame with a chamber having a piston slidable between first and second cavity ends of the chamber, and a cable assembly for pulling the piston by an applied force towards the second cavity end to cause a vacuum in the chamber to exert a resistance force on the cable assembly. A cable subassembly extends between first and second parts of the cable assembly, comprising a pulley wheel attached to the first part and a cable extending around the pulley wheel having first and second cable ends. Stoppers on the cable ends engage a bearing member to restrain movement of at least the first cable end when the second cable end is pulled relative to the pulley wheel. Releasable connector means connect the cable ends to the second part to allow a user to choose a magnitude of the resistance force opposing the applied force.

An adjustable exercise machine for performing resistance exercises comprises a base and an upper frame including front and back end stationary exercise platforms, and a movable exercise platform that reciprocates between the stationary platforms. A plurality of biasing members is selectable by an exerciser via selector knobs to generate a bias force against the movable platform. A plurality of pivotable lift supports are connected between the base and the upper frame. Front and back actuators are connected between the base and the lift supports by lifting yokes to selectively raise and lower the front and back ends of the machine. The movable platform may be connected to move along the exercise machine by trolley wheel assemblies. A plurality of travel limit decelerators mounted on the rails engage and rapidly decelerates the movable platform as it reaches its limits of travel on the rails.

An exercise machine support system for providing increased versatility including inclination or declination of an exercise surface, a reduction in the overall length and width of the exercise machine, and an enhanced user interface which reduces the risk of injury. The exercise machine support system generally includes a cantilevered exercise machine which is adapted to have a variable angle of incline or decline with respect to a horizontal ground surface. The exercise machine will generally include a base and a support which extends between the base and the exercise machine. The upper end of the support is connected to the exercise machine by a first pivot such that the exercise machine pivots about the support. An adjustment device may be utilized to pivot the exercise machine and thus adjust its angle of incline. Various types of adjustment devices are disclosed, including an actuator, ratchet-and-pawl, gears, and cam.

A treadmill contains a body, a support assembly, a resistance unit, and a stop strap. The body includes a holder and a circular running belt. The support assembly includes multiple posts and two columns, wherein each column having a slidable space, and the slidable space having two first chutes. A resistance unit includes two sliding devices, two limitation structures, and a force exerting element. The respective sliding device has a slider and multiple first rollers. The respective limitation structure includes two cylinder units, a resilient unit, a first fixing unit, and a second fixing unit. The force exerting element has two connection rods connected on two ends thereof, and the respective connection rod of the force exerting element is coupled with the coupling portion of the slider of the respective sliding device.

An exercise machine inclination device for providing variable exercise intensity on an exercise machine by inclining the exercise machine. The exercise machine inclination device generally includes a base adapted for being positioned upon a floor, a support structure adapted for supporting the exercise machine, a hinge pivotally connecting the base and the support structure and an actuator connected between the base and the support structure, wherein the actuator adjusts an angle of the support structure.