NU2DIVING:I did it again and as you suggested I completely emptied my lungs and tried to blow out and then locked my throat closed. I was able to manage 30 seconds this time.
Mike
That's great! When you fully exhale, blow your short bursts and count how many until you do your hold. Should be about twenty or so. Just curious, is it uncomfortable? Just for kicks, try a reverse breath hold, this time while jogging in place. This build up the CO2 that much quicker. This is apnea training at its finest.