Originally Posted by name goes here
I've watched some old 'no rules' fights (videos) and some vale tudo vids. The basics stay the same. Without the round breaks, cardio is more important. Headbutts do not add as much as you imagine - yes Kerr used them well, but he was fighting uneducated opponents. I haven't seen anyone attack the groin - seems to be a gentleman's agreement.
Well, you can't say that anymore! lol