Likwid said:
I don't think you can say it's strength, stamina, speed or whatever. There are a ton of athletes out there that can't fight for shit and a lot of non athlete types that can throw with the best of em. In my opinion I think the majority of it is psycological, if someone isn't mentally tough, their physical won't be tough either. If your mind isn't ready for the figh, consider yourself KO'd.