Question

This principle indicates the need for individual to perform a specific type of exercise to improve fitness of a specific body parts

Answer 1

The exercise principles outline the criteria that guide all training.  Each principle allows us to critique some element of a person’s training.  When a person’s training follows the principles well it is most likely to be successful.  Following is a list of the principles and their definitions (in lay terms as well so we don't get to 'fancy pants scientific'.