Big powerful arms will not help you on the court unless you are a post player. They will not help you become a better shooter; in fact, they will impede your ability to shoot. Big muscles can be an advantage if they are used correctly by playing sports such as wrestling and bodybuilding but they can also be a disadvantage if you try to play basketball with them. The best argument against heavy exercise is that it can lead to injuries. If you're exercising heavily and improperly, you can easily end up with torn ligaments or other damage that will keep you off of the court for long periods of time. In conclusion, big muscles are great, except if you are a basketball player. In this case, big muscles are just going to hurt you. It's best if you stay light on your feet and use your brain instead. That way, you'll be able to avoid getting beat by the other teams' guards who know how to protect the basketball.