Air in lungs makes you less buoyant?

[sclim]

Originally Posted by CoachStuartMcDougal

I've seen (actually heard) swimmers humming in the water to control the exhale. Then dump air quickly as they roll to breathe. Although I don't hum, I sometimes try it to feel the difference between my slow controlled exhale vs humming. It's about the same, but humming is a bit slower. In any case, humming to control the exhale will give swimmers an idea of how to control the exhale and not dump air too early

Stuart

Great idea: will try.