Far too many guys fail to realize that lifting is actually a catabolic activity - meaning it breaks down muscle fibers as opposed to building them up. Lifting serves as a stimulus to build more muscle during your recovery bouts between sessions. In other words, what you do between your workouts has a far larger impact than your actual time spent in the gym. Poor nutrition and improper sleep patterns can sabotage the best workout plan. Rather than obsessing over your workout details, stick with a basic plan that works. Focus the rest of your energy on all of the factors that occur between gym visits.