Sprinting and sprint racing is all about two things. Running as fast as
you can and maintaining it over the entire distance of the race. It may
surprise you, but even in a 100m race it is not possible to sprint 100% flat out
the whole way, you would tire and slow towards the end. This is even more
of a factor in a 200m race.
So, we are looking to train for pure speed and also for speed endurance
(which is the maintainence of speed up to the point at which high levels of lactic acid
start restricting speed).