Dr Andrew Sellars argues the limiter most cyclists never train is their breathing. As a respiratory physiologist and co-founder of VO2 Master, his point is that for some riders the legs aren't the problem at all — inefficient breathing mechanics and a low tolerance to CO2 cap the effort before the muscles do. It's an unfashionable corner of performance, and that's exactly why it's full of free gains: respiratory muscles are trainable, and for the right rider that work shows up directly in sustainable power and recovery between efforts.
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