Charlie Kenton is a washed-up fighter who retired from the ring when robots took over the sport. After his robot is trashed, he reluctantly teams up with his estranged son to rebuild and train an unlikely contender.
There is a scene where Charlie, an adult man, takes his shirt off to put on a clean one. He also asks his love interest, Bailey, if she wants to take a shower with him. It's flirty, but no clothes are removed beyond his shirt.
In the latter half of the movie, the main characters are attacked by someone who Charlie did not pay as he agreed to, much earlier in the movie. He, along with two goons, thoroughly beat up Charlie and steal his cash, as well as Max's. Though they do not injure Max, one of the goons does restrain him from helping his father. I believe at some point, Charlie is hit with a crowbar or other long object, but most of the fight is hand-to-hand.
Near the beginning, a robot gets his leg torn off by a bull. Other fights show other limbs being torn off. It's not a human/animal limb, but I would say this counts.