Which of the following training principles dictates increasing load or intensity each mesocycle?

Progressive overload

Explanation:

The overload principle is a deceptively simple concept. To make fitness gains you have to overload the body progressively. Lift heavier weights, run longer, workout more days a week, and so on in order to provide enough stress that the body will adapt and get stronger, faster, and more powerful.

As a trainer you surely know what the overload principle is, but do you really understand it? Enough to plan the best program for each client? We’ll run through the basics of overload and provide some important tips for progressively and safely overloading your clients until they hit their goals.

the answer is a a teenager needs more sleep than the adult no matter what