Most elite sprinters are strong as f**k. It's a power sport. Speed is power, power in sprinting = a greater forced application. Drugs or not, he was would have been a 475lb + squatter. When I go to USC to observe, I see the some of the athlete on the mens track team out squatting the football players. As far as upper body, the power has to be just as equal since upper body power is at lease 20% + in sprinting. The greater arm action and elbow drive the more power translates to the lower body, for every action there's a opposite and equal reaction.