Put enough people in space and eventually one of them will want to punch another. Now, how would that fight happen though?
From an article I found: http://uproxx.com/gammasquad/2014/10/how-do-you-fight-in-zero-gravity-heres-everything-you-need-to-know/
And not just that, we also have to think about other aspects, such as how to transfer the maximum amount of force to your punches and kick - would a spin kick be more effective due to centrifugal force? Would simply increasing your total mass deliver more forces behind your punches, making an obese fighter as effective as a muscular fighter?
For this thought experiment, let us assume we are having a space fight club in some frontier asteroid colony, no artificial gravity, and using a spherical cage arena. What kind of fighters and fighting style would be the most effective?