My kickboxing teacher just said "breathe like this" and nobody had time to ask questions. I've often found it to be pretty beneficial to have proper breath cont

My kickboxing teacher just said "breathe like this" and nobody had time to ask questions. I've often found it to be pretty beneficial to have proper breath control. Because breathing in through your nose when exercising hard isn't instinctive, you practice breath control very consciously. I must admit I'm a little curious what kind of woo-woo could surround proper breathing.