Eat your protein! you need it to excersise with that is what builds healthy muscle. You need calcium or you will have bone loss or damage you don't have to drink milk but do take the pills or something. You are at a very healthy weight. Remember if you stop excerising the muscle will turn to fat. So my advice is to have a healthy rounded diet and enjoy your excerise of choice and have a TPLAY- True, Positive Look At Yourself.