Four years later he broke the Czech national records for the 2,000, 3,000, and 5,000 meters. Zátopek developed his own training methods to give himself an edge. He’d run as fast as he could holding his breath, take a few huffs and puffs and then do it all again. It was an extreme version of Buteyko’s methods, but Zátopek didn’t call it Voluntary Elimination of Deep Breathing. Nobody did. It would become known as hypoventilation training.
