Why sprinters usually take off at an angle rather than upright position

During a drive phase sprinter are trying to get as much of their momentum built up so that at top speed, it is easier to maintain.

Keeping the head down allows the sprinter to more efficiently by applying their power in a forward motion as opposed to an upward motion (the type of motion one gets from running straight up). This means that when their feet hit the ground, they are pushing back instead of pushing up.

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Dr. Bbosa Science