Martial D
Senior Master
They will help you a great deal of you grab them by the throat and smash them it a wall, , there are good fighters all over the world that have never been anywhere near a ring an octagon or a dojo, any sports that gives you movement, reactions and co Ordination will help with fighting
Sure there are.People learn to fight by...fighting. No martial training required.
Learning how to shoot 3 from the outside won't help you throw a solid punch though. Just being in shape, although helpful, wont make your awkward strikes less awkward, nor will being able to do a lay up help your ability to wrestle. Ive yet to see the untrained fighter that can step into a ring and just get by on athleticism with someone that does have actual skills, any more than I could go play ncaa ball with my boxing skills.