Explanations: In exercise: Specificity. The principle of specificity derives from the observation that the adaptation of the body or change in physical fitness is specific to the type of training undertaken. Quite simply this means that if a fitness objective is to increase flexibility, then flexibility training must.
For example, a runner should run to improve running performance. However long-Term adaptations to Exercise Training . A trained persons can continue to increase up to near maximal rates of work ,While cardiac output to go to active skeletal muscles .