A weight system having at least one weight stack moveable in a vertical direction on a lift rod, and a bearing block for housing a linear bearing. The invention further includes a method and apparatus for aligning the linear bearing.

A weight system having at least one weight stack moveable in a vertical direction on a lift rod, and a bearing block for housing a linear bearing. The invention further includes a method and apparatus for aligning the linear bearing.

A weight system having at least one weight stack moveable in a vertical direction on a lift rod, and a bearing block for housing a linear bearing. The invention further includes a method and apparatus for aligning the linear bearing.

A weight plate gap adjustment module for weight training equipment includes an elastic member located at the topmost weight plate of the weight training equipment and having a supporting portion arranged on the weight plate adjacent to the topmost weight plate, and an adjustment member set on the topmost weight plate and movable toward the elastic member to increase the elastic force of the elastic member, so that when the elastic force of the elastic member is greater than the total weight of the topmost weight plate and the traction shaft, the elastic force of the elastic member drives the elastic member to push the topmost weight plate and the traction shaft to move relative to the other weight plates, allowing the locking pin to be selectively inserted through one weight plate and the traction shaft and joined to the traction shaft.

A weight delay device for weight training equipment includes a delay member vertically movable between a second top dead point and a second bottom dead point, and a locking assembly vertically movable with the main weight device of the weight training equipment and having a positioning member selectively locatable at a first position or a second position. When the positioning member is located at the second position and the main weight device starts to move from the first bottom dead point to the first top dead point, the positioning member and the delay member are combined with each other, so that the delay member moves with the main weight device to the first top dead point.

A dumbbell with a selectable number of weight disks includes a handle with pins projectable in opposing directions, a base assembly for accommodating two sets of weight disks standing upright, and having through-going openings. Neighbouring weight disks have mutually cooperating connecting arrangements which axially interconnect the weight disks but which permit radial separation. The projection lengths of the pins are stepwise selectable in order thereby to permit selection of the number of weight disks carried on the handle. The handle has, in opposing ends, connecting arrangements for interconnecting with the connecting arrangements of the innermost weight disks in the base assembly. Further, the space between the connecting arrangements of the handle is free through 360° about the handle throughout its entire length, the openings of the weight disks being centrally located.

An auxiliary drive for a training device, comprising a first force measuring device, a control device, and a drive unit, wherein the control device determines a target force F.sub.S,max, the first force measuring device determines an actual force F.sub.S which is applied to a main traction means and which is caused by an acceleration of a movable mass connected to the main traction means. The first force measuring device also transmits the determined actual force F.sub.S to the control device, and the control device also compares the actual force F.sub.S with the target force F.sub.S,max and controls the drive unit such that, if the actual force F.sub.S exceeds the target force F.sub.S,max, an auxiliary force F.sub.Z having a component that offers resistance to a gravitational acceleration acts on the movable mass by connection of the drive unit to the movable mass.

In described embodiments, a strength testing device that can be applied to a weight stack is provided. The strength testing device can be used in physical therapy, chiropractics, or other rehabilitation professionals to assess the strength of a patient. The strength testing device can also be used in the fitness industry by strength coaches and personal trainers.

According to one example, an exercise system includes a base, a vertical housing extending vertically outward from the base, a first weighted touchpoint moveably coupled to the vertical housing, a second weighted touchpoint moveably coupled to the vertical housing, and one or more weight systems configured to provide weight to the weighted touchpoints. The exercise system further includes a control system that determines randomized workouts that include a random selection of a muscle group, a weight amount, a weight differential, a number of sets of an exercise, and/or a number of repetitions in the set. The control system may also cause the weight system to adjust the weight of the weighted touchpoints based on the randomized workout.

Improved designs for exercise machines that facilitate muscle development and other therapeutics are disclosed. The machine includes a frame, a pulley assembly, and cable extending through the pulley assembly. The cable has attachments, including an attachment for connecting to a pull handle. The cable is also connected to a selectively variable moveable resistance unit. This unit is structured to provide an elastic resistance when a pulling force is applied to the pull handle. The unit is connected to the cable and includes an elastomeric body that provides the elastic resistance and also includes an arc plate that provides a curved support member on which a portion of the elastomeric body at least partially wraps around. Movement of the arc plate causes the elastomeric body to stretch and to provide the elastic resistance.