Ok, I need some advice on what to take to extend my endurance. I do alot of M.M.A, and sparring everynite. Now, I broke my nose, and have to wait a month to get it fixed. Meanwhile, with the lack of air, within 20secs of each round, struggling to breathe, I get winded. I feel like I have lead for legs, and I become super slow. My main aspect was my speed. I feel if I had a booster, it would greatly help. N02? I know my nose is the problem, but it is killing me to be in this state.