How often should you work out? Once per week, twice, five times? The answer differs depending on how trained you are.
Beginners Vs. Intermediates
A beginner can get away with training the entire body several times per week, as a lot of the exhaustion he feels doesn’t come from the muscles being exhausted, but from the brain, which is trying to command the muscles into doing the movements. The better this connection works, the more muscle fibers are recruited into the movement and the more weight the beginner can move.
An intermediate or advanced trainee will have established most of this connection and in order to gain strength, his muscles really have to gain in size and that leaves them exhausted for longer: