After I workout I notice that my muscle definition isn't the same as before my workout. I know that the muscles are pumped which accounts for most of the puffy look. But by the next morning the muscle definition is back and looking better than before. I don't take any supplements outside of a protien drink post workout. All things being equal I was just wondering why some guys look ripped in the gym when they are pumped and others look like they were blown up with air even though they have the same body fat levels and same muscle composition.