"A beginner's workout often takes more time than those of an intermediate or advanced workout. The reason for that is because beginners do full body workouts, which obviously take more time than splits. However, an intermediate and advanced bodybuilder must spend more time in the gym weekly than a beginner bodybuilder. The reason for this is because the muscles of an intermediate or advanced bodybuilder recover quicker than those of a beginner. Their body is used to the constant intense stress of weightlifting and therefore will not respond as it once did before. That is why beginners take frequent off days so their bodies can get used to the stress." My weight training instructor sent me this in an e-mail, but he didn't answer my question whether I need 2-3 days of rest per week instead of my current 1-2 days of rest per week.