An additional advantage of preventing injuries is that you can spend more time working out instead of recovering.Vars Performance Stop working out right away if you begin to feel pain. Muscles and tendons are fragile, and you should never overextend them just to add muscle. If you start to get sore, give yourself a day to rest and let your body get back to normal.Vars Performance Your diet is an important part of your training. Muscle building requires a diet high in protein and lower in fat. Do not assume that you should do this by simply eating more. Instead, you should make it a point to consume a balanced diet.