An exercise machine with a two directional pivoting user support assembly has a user support or platform which supports the user and pivots about a first pivot axis during an exercise movement, and is also pivotable about at least one second pivot axis to involve the user's core muscles in balancing and maintaining the user support in a stable position. A manually operable locking device with a simple flip switch lever is provided for selectively locking the user support against rotation about the second pivot axis, so that the user can easily chose whether to perform the exercise with a stable support or to add a level of difficulty by using the unstable seat mode and exercising core muscles during the exercise.

A weight stack isolator comprises an impact damper having a rail void therein configured to receive a guide rail of a selectorized machine. The impact damper is shaped to at least partially surround a section of the guide rail when received in the rail void, to secure the weight stack isolator to the selectorized machine. The weight stack isolator may include a slit extending from its outer perimeter to the rail void or the rail void may extend to the outer perimeter, to removably receive the guide rail in the rail void. The weight stack isolator can be positioned under a weight stack of the selectorized machine to absorb or dampen noise and vibration.

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 neck exercise apparatus includes a neck lever pivotably attached to a channel member. The neck lever has a head portion in front of the channel member. The neck lever is selectively movable along the channel member and the neck lever pivots about a pivot point that is located behind the channel member. The neck lever includes a weight attachment element configured to receive incremental additions of weight.

A weight pin for use with a stacked weight exercise machine includes a handle portion, and a shaft portion extending outwardly from the handle portion. The shaft portion is configured to be removably positioned adjacent to one or more weights of the exercise machine to selectively engage the one or more weights during use of the exercise machine. The weight pin also includes interrogation circuitry arranged relative to the handle portion, the interrogation circuitry configured to read information from the adjacent one or more weights.

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.

An weight plate gap adjustment device for weight training equipment includes a locking pin having a taper on the body thereof and being detachably coupled to a hole of one weight plate and a traction shaft of the training equipment, and an inserting member having a coupling portion that has a taper corresponding to the taper of the body of the locking pin. The inserting member is mounted in the hole of the weight plate so that when the locking pin is coupled to the hole of the weight plate, the body and the coupling portion are closely abutted with each other to eliminate the gap between the locking pin and the weight plate.

An auxiliary weight adjusting device for weight training equipment includes a selector device and auxiliary weight pieces. The selector member of the selector device is provided with positioning portions and rotatably installed on the main weight device of the weight training equipment. The selector device has positioning members arranged on the selection member in a manner of moving in a horizontal direction and corresponding to the positioning portions. The auxiliary weight pieces are adjacent to the main weight device by moving up and down in the vertical direction and correspond to the positioning members and arranged in a straight line or an array in the horizontal direction. The rotation of the selection member makes the positioning portions drive the positioning members to extend toward the auxiliary weight pieces, so that different numbers of auxiliary weight pieces move with the main weight device.

The therapeutic isometric testing and isotonic training exercise device disclosed herein may allow for isometric strength testing and isometric and isotonic strength training of a user to prevent or treat soft and connective tissue deficiencies. The device may comprise, generally, a leg press, chest press, and shrug press exercise device combination having a plurality of electronic components. The device may comprise a seat assembly and weight stack assembly connected to an articulating frame, and may further comprise a weight locking pin and a plurality of load sensors for user work measurements. A proprietary software may be integrated into the device, and each user may have a personal user account and customized training regimen designed for them based on system inputs and readings.

An exercise apparatus suitable for promoting Long Strength Development (LSD) in an exerciser may include an apparatus frame. At least one pair of left and right outer gliders and at least one pair of left and right inner gliders may be pivotally mounted on the apparatus frame, the inner gliders arranged inside the outer gliders. The outer gliders and the inner gliders may be independently positional between an outwardly extended position and an inwardly retracted position. A weight rack may be provided on the apparatus frame and may be connected to the outer gliders and the inner gliders through a cable and pulley system. The weight rack may be selectively connectable to the inner and outer gliders.