Almost a 1/2 second better than his previous personal best. In one year he improved his PB in the 100m by 0.34 seconds and 0.45 seconds in the 200m. A feat that has never been done at the world class level, even by known PED users. Who's his chemist?
Another bit of information, Bolt ran into a - 0.9 m/s headwind. That adjusts to a 19.23 with no wind and a 19.12 with a legal +2.0 tailwind. Johnson had a slight tailwind when he ran 19.32.Edited by: SteveB