" Exercise does not PRODUCE physiological improvement, increases in muscular size and strength; instead exercise STIMULATES physiological changes. But any actual improvements that follow are a result of the body's response to that stimulus provided by exercise. The things you can be, the limits of your potential size, strength, intelligence and several other things, were determined before you were born, were dictated by your genetics; but what you will be is largely determined by stimulation provided by experience."

– Arthur Jones