ive been working on a Dive Apnea app in my iPad. I'm getting better at holding my breath but I know my technique is probably poor. But the question I have do any of you start yawning a bit in between your excercises? It seems like that is one of the first things that happen as I'm getting into the reps of the excercises. I'm pretty sure what I have been working on is the O2 tables.