FWIW, Usain Bolt trains about as much as a motivated amateur athlete (roughly 90 minutes a day). The big difference between the two being that motivated amateur

FWIW, Usain Bolt trains about as much as a motivated amateur athlete (roughly 90 minutes a day). The big difference between the two being that motivated amateurs have day jobs, whereas Usain Bolt does not. His success is almost entirely talent, in other words.