You see, steroids aid in the recovery. So you can train body parts more often if you so desire. When natty, muscles need 72 hours of rest to recover. Remember the growth of muscle tissue takes place in the recovery phase. So if you are not getting enough rest, the muscle can't grow properly. Steroids allow you to cheat that some. I usually run a 3 day split, and when on I do at least 5-6 days in the gym per week.