No matter how often I read "Play with stamina bar on" I will NEVER do it. It's not street fighter for F's sake! I've already lost fight because of it, but that's just how it goes.
It's also not real life. In real life you would be able to feel how tired you are and guess your opponent by physical tell tales that aren't able to be shown with today's graphics. You're just needlessly handicapping yourself., but whatever.
Remember this is closer to Street Fighter than it is a real MMA fight.