Is boxing a sin

There are three components to sin; intent, situation, and the action itself. If you are intending to hurt someone while Wrestling, you may perceive it as a sin. Situation is crucial to sin, as well; if a man is attempting to harm your family and you wrestle him to the ground in self-defense, is it a sin? Finally, the act itself; the act actually has little significance on the overall outcome of a situation. Sin is all in the "how" and "why".