As a former semipro football player, amateur baseball player, and amateur boxer, I can look back and say there was inherent violence in each of them. I was a fullback/linebacker in football, which meant every play I was either trying to run over someone trying to tackle me; I was trying to block a defensive player into the parking lot, or I was trying to knock a ball carrier into the next zip code...while all the time others were trying to do thus to me. In baseball, I was a good hitter, decent pitcher...but not too speedy. I ran the base paths HARD...& wouldn't think twice about sliding into a base with my spikes flashing...just as my opponents wouldn't think twice about tagging me in the face, or where the sun doesn't shine...or throwing a pitch at my head, or me at theirs. As for boxing...Every participant knows his/her opponent is there to try to hurt them while not getting hurt. It's a big sport involving big money, and it isn't gonna go away.
Think TODAY'S soccer riots are bad? Read 2 Samuel 2, begin.V.12. ans see what became of a "friendly" rivalry and contest!
And David, one of God's all-time favorites, was a MAN OF WAR, who killed many enemies by his own hand. He was about as violent a man as ever lived. But the ONLY death charged to him was that of Uriah.
Many of our sports came directly from acts of battle. Archery, fencing, wrestling, boxing, and javelin-throwing speak for themselves. But hurling the discus, hammer, & the shot-put also come from war. The discus was just about the heaviest object a man could hurl a decent distance, as the "hammer" became later, while the shot-put was named for the practice of hurling or dropping cannon balls(shots) upon nearby enemies when there wasn't enough time to load a cannon, or the enemy was too close to aim the cannon at. Most of the time, these objects were hurled or dropped from a height, such as a rampart, on the assumption that gravity would aid the hurler, and the enemy couldn't hurl the objects back.(Remember Abimelech, struck down by a small millstone hurled by a woman)
Relays and individual runners were used to carry messages across a battlefield. Most equestrian skills and moves were developed for use in battle.Pole-vaulting was used to scale walls.
This is just a short list, but I see nothing sinful in sport itself. It's the INTENT behind the sport and of its players, fans, boosters, and promoters which can be sinful.