# Tweet by [@keefmoon](http://twitter.com/keefmoon) on 2019-05-04 10:11:32 > [!INFO] Archived from [original tweet](http://twitter.com/keefmoon/status/1124617549667274752) RT @slondonuk: Michael Phelps’ biological quirks (including producing 50% lactic less acid) saw him revered as a champion while Caster Seme…