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
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