The amount of overload needed to maintain or improve one s fitness level is not determined by

Progressive overload is defined as the adaptation of the body to a steady increase in the amount of the exercise. The amount of overload needed to maintain or improve one’s fitness level are all determined by the frequency (F) of training, intensity of training (I), time allotted for training (T), and the type of training (T); or FITT. Specificity of training is a training principle wherein the body reacts and adapts to the training with respect to the type, therefore the amount of overload is not determined by specificity.

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.

a symbiotic relationship with the mitochondria