What is the purpose of a cam system in resistance training?

The purpose of a cam system in resistance training is primarily to alter resistance in a way that better accommodates the natural strength curve of the muscles being worked. A cam system achieves this by changing the angle and radius of the resistance applied throughout the range of motion during an exercise. As the angle changes, the resistance provided by the cam can be adjusted to match the strength profile of the muscle at different points of the movement.

For example, this can help ensure that the resistance is lighter when the muscle is weaker (such as at the beginning of a lift) and progressively increases as the muscle reaches a stronger point in its range of motion. This tailoring of resistance can lead to more effective training, as it helps to target specific muscle fibers and improve overall strength development more efficiently than traditional fixed-resistance systems.