I've noticed that I often have to yawn when the cooldown portion of a workout begins. I try to "keep my lungs open" throughout the workout, and yet half the time the yawning happens anyway, especially if it's some floor-based stretching :-))) I workout just before lunchtime, so it's not like it's sleep time :-)

Does this happen to anyone else?

(sorry if I made you all yawn! It's so contagious that even reading about it can make you yawn!) :-)))