"I got exercises," said Max. "Shoulder press, pull ups, shoulder flies, front plate raises, that sorta thing. If you want to get stronger shoulders. But, uh you should really wait to do any heavy liftin' until you're at least 13 or 14; your body needs a chance to mature, first. Chin ups and pull ups would be best for you. Hanging from the bar to start with, if you can't manage that. Then once you get to high school age you can start on light weights and work your way up."