From watching some of the vid's of fighters, some of them don't seem to have learned how to breath correctly, especially in between rounds, when you can get some wind back. I'm amazed, if it were me, I'd be spitting that mouthpiece out and sucking in as much air as I can inbetween rounds. That said, I recently learned a few deep breathing techniques, and I immediately noticed an increase in performance and endurance, simply by doing a few breathing exercises before the workout, inbetween the workout, and afterwards. I am not "skilled" enough to teach deep breathing techniques, as I'm just learning myself, but I wanted to share just what a HUGE difference it is. That said, I'm hoping someone who is skilled in breathing techniques will share with the rest of the group. The one that has just worked miracles that I do, is I press the pressure point about 3" below my belly button, and inhale to try to "inflate" that part, this fills the lower 3rd of your lungs. First time I tried it, got really dizzy, but now, after a few breaths like that, I can feel increased O2 supply.