A basic training principle which states that, in order to improve a particular component of physical fitness, a person must emphasize that component in training. A training programme must stress the physiological systems used to perform a particular activity in order to achieve specific training adaptations. Consequently, a weight lifter who trains only for strength and power will probably be stronger than an untrained person, but have no better aerobic endurance. See also principle of progressive overload.
Subjects: Sports and Exercise Medicine.