Pat I suggest talking to some of the older people at your gym or joining a website about body building and/or fitness. Once a day is way too much, you will see minimal to no gains and will hit plateaus at every turn. The overall consenus is either 4 days doing 2 body parts per day or 3 days at the gym doing a full body workout everyday. Your muscles need 72 hours to recover, you probably can't feel any negative side effects because you are young (which is very dangerous I might add).