Keep with it building lean muscle mass is way important... doing the corect technique of a stroke is more important than how much weight ur lifting. Weight gainer protien powders are ok but the only supplement that truely works in buiding muscle mass is Creatine Monohydrate. IT is the only one thing that wil add to your Kreb cycle to produce more glycogen cells for enegry and muscle. Also if u wish to have bigger biceps then do preacher curls and concentration curls to bring the peak out more. also wrist curls will help you in strength needed to do more upper body excercises...