The body was to maintain equilibrium. Developed equilibrium and maintain it. It's not about what you but the varying of intensities of what you. It's also about avoiding repeatedly stressing the same parts while understressing the same parts and yes, before you ask, every joint has different parts which respond in different ways to different stimuli. Intense use is the key while not overstressing the CNS (I did that deliberately) while varying the areas of adaption so no one area is over or under stressed.
Westside