The easy answer is: Because they need them. Arm action in sprinting is often described as 'hammering nails in a wall behind you'. The faster your arms are moving, the faster your legs will go. read more
Both sprinters have upper bodies according to their body type. Ben, being a power sprinter, had a well built upper body that helped him start and accelerate aggressively, while Carl had a light but strong upper body that helped him maintain form at the end of a race and decrease his deceleration. read more
You'll avoid getting 'too big' by putting in a volume of sprint training, in combination with weight training. Quite frankly it's just very difficult to do the level of conditioning that a sprinter must do and get 'too big.' Some people mistakenly believe that sprinters don't need upper body size and strength. They do. read more
It Continues on the Track. You may not be able to sustain maximum sprint speed for very long, but sprinting does have a much bigger impact on your metabolism than steady state cardio such as jogging. A typical sprint program mixes distances from 20 meters to 600 meters, according to athletics coach Brian Mackenzie. read more