If you choose to take any supplements to aide in your muscle building routine, do so cautiously. Many supplements are a complete waste of money, and some can even be harmful to your health. Discuss any of your supplement plans with your physician or a licensed dietician to make sure that you are not harming your body.
Any time you are lifting a heavy free weight, it is very important that you have a spotter. This is someone who knows the routine that you are doing and also understands when you are requiring help.