"To minimize the touchdown distance, and get the most out of this action, the sprinter must be very strong in the hamstrings and gluteal muscle since these are needed to pull the body over the touchdown point during the initial portion of ground contact. More than any other factor the strength of these muscles dictate the success of a sprinter. Pulling the body over the touchdown leg in the first 20-30% of ground contact is the only way to produce the needed vertical forces economicaly"( Ralph Mann)
Thoughts?