The Secret to Holding Your Breath for 20 Minutes

Illusionist and stunt performer Harry Houdini was famously capable of holding his breath for over three minutes. But today, competitive breath-hold divers can squeeze ten, fifteen, even twenty minutes out of a single lungful of air. How do these divers do it — and how can you train to hold your breath for longer? » 3/12/14 1:23pm 3/12/14 1:23pm