Wayde van Niekerk is a South African track and field sprinter who competes in the 200 and 400 metres. In the 400 metres, he is the current world and Olympic record holder, having set the record in the Olympic finals.
van Niekerk at the 2017 World Championships
Sprinting is running over a short distance at the top-most speed of the body in a limited period of time. It is used in many sports that incorporate running, typically as a way of quickly reaching a target or goal, or avoiding or catching an opponent. Human physiology dictates that a runner's near-top speed cannot be maintained for more than 30–35 seconds due to the depletion of phosphocreatine stores in muscles, and perhaps secondarily to excessive metabolic acidosis as a result of anaerobic glycolysis.
Usain Bolt, world record holder in 100 m and 200 m sprints
This sprinter's initial crouch in the blocks allowed her to preload her muscles and channel the force generated from this into her first strides.
The stadion of ancient Nemea, Greece.
Start of the women's 60 m at the 2010 World Indoor Championships