A portable exercise device includes a pedal spaced away from and pivotably connected to a base and having a neutral position relative to a pivot axis. The pedal is configured to rotate about the pivot axis in a first direction toward the base and in a second direction, opposite the first direction, toward the base. The device also includes a resistance mechanism configured to exert a force on the pedal about the pivot axis in a direction opposite to the respective direction of rotation of the pedal. The device is movable between an open, in-use configuration, where the pedal is disposed in the neutral position to receive a foot and spaced away from the base, and a closed configuration, where the pedal is adjacent the base.

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 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.

A computing system for determining osteogenic loading from an exercise apparatus for performing an exercise is provided. The exercise apparatus includes a loading interface, a frame, a linear adjustment system interposing between and fixedly coupled to the loading interface and the frame, and a sensor coupled to the linear adjustment system. A position of the loading interface of the exercise apparatus is adjusted through a movement of the linear adjustment system at one or more intermediate positions of a plurality of functional positions of the loading interface. A force exerted by a subject on the loading interface at the position in the one or more intermediate positions is received. A measurement of the force exerted by the subject on the loading interface at the position in the one or more intermediate positions from the sensor is obtained. A corresponding osteogenic loading for the force exerted by the subject is determined.

The present invention relates to a chest expander including a head, two operating arms of which upper end portions are coupled to the head using rotating shafts, and at least one gas spring disposed between and coupled to the two operating arms by a lower end of the gas spring being rotatably coupled to one operating arm and an upper end of the gas spring being coupled to an upper portion of the other operating arm, wherein a moving hole extending in an arc shape about the lower end of the gas spring is formed in the upper portion of the operating arm, a slider is provided to movably support the upper end of the gas spring along the moving hole, and the slider includes a stopper which fixes the slider.

A device for an exercise apparatus includes a linear adjustment system and a sensor coupled to the linear adjustment system. The exercise apparatus includes a loading interface and a frame coupled to the loading interface for performing an exercise. The linear adjustment system fixes the loading interface of the exercise apparatus at any one of a plurality of functional positions in a functional range of the loading interface. The sensor measures the force exerted on the linear adjustment system. A correlating mechanism is used to correlate the force exerted on the linear adjustment system with the force exerted on the loading interface. The device allows exercisers to exert high or maximum loads in any one of a plurality of positions throughout their entire range of motion without first passing through a weak range of motion.

An exercise machine is disclosed. The exercise machine comprises a tension generating device. The exercise machine comprises a translatable arm mount coupled to the tension generating device. The exercise machine comprises an arm coupled to the translatable arm mount. The exercise machine comprises a cable coupled to the tension generating device via the arm.