And the speed workouts here are always a killer ( e.g. 4 x 800m , with 3 min gap in between each 800m ) , but are essential for the adaptation of the body to the stresses subjected to the body at that speed and .
Become more efficient .
And the speed workouts here are always a killer ( e.g. 4 x 800m , with 3 min gap in between each 800m ) , but are essential for the adaptation of the body to the stresses subjected to the body at that speed and hence become more efficient .