I totally disagree. The thing I want to push my body is the specific exercies I'm doing. If you're rolling five minute rounds or sparing five minute rounds. Or doing HIT training, or circuits, or pad work, its quite effort enough to concentrate on putting 100% into the technique. I'd rather spend my energy in hitting harder, moving quicker, being more explosive, more fluid, more skillful. From the first second of the first round to the last stretch at the end. Anything that makes that goal harder I try to avoid, so I get the best equipment I can and try to avoid temporature extremes.