The training theory that exercise is relative to the ability of the person conducting the training.


How difficult it is to complete a muscle movement over a number of repetitions given a specific weight.

Interval Conditioning

A form of training that utilizes repeated cardiorespiratory effort intervals performed above intensities achieved during continuous training. Interval efforts are followed by cardiorepiratory recovery intervals.

Isometric Muscle Action

The muscle action that occurs when a muscle is contracted but stationary resulting from equilibrium between the muscle force and resistance.