I am a HUGE fan of boxing and MMA, hence my screenname. I've asked myself this question before, as have others. I don't think boxing or any type of fighting sport is immoral. When it comes to inflicting physical punishment on someone, the issue at hand is always the motive behind it. In boxing or mma, the goal is to push your body to its limits, and through sheer skill and determination, come out victorious or at least have a good showing by giving it all you've got. Of course, there has been many boxing matches in which both combatants had a genuine dislike for one another. The moral dillemma lies within the hearts of those two combatants, not the sport. Boxing is a challenge and requires 100% commitment if one is to excel. Most of the time a boxing match consists of two athletes who have dedicated themselves to strict regimens and discipline and are not motivated by hate. In fact, dozens upon dozens of some of the bloodiest prizefights have resulted in lifelong friendships between the fighters who have developed respect for one another after trying to pummel each other to death.
Paul the apostle seems to have been a sports fan himself, as another poster have shown with the Biblical verses. Certainly, Paul did not condemn boxing even though he demonstrated that he was well aware of its existence, using boxing metaphors to describe our walk. In fact, Jesus Himself was a boxing fan, giving sound boxing advice with verses like, "It is better to give than to receive," or "turning the other cheek" which is a clear reference to rolling with the punches. JK! But I thought that was funny. Hehehe. But seriously, I personally feel that boxing is a great metaphor for life. Some people describe life as a journey, while some simply think it's a party. Some even say life's a beach. I think life is a fight in which you will certainly take punches, get knocked down, get back up. and keep on fighting. You swing and miss, take the lumps, roll with the punches, dish out some of your own, get bruised and bloodied. It's okay to get knocked down. The important thing is to get up by the count of nine.