What part of the body accounts for 50% of a runner's acceleration?

Name: What part of the body accounts for 50% of a runner's acceleration?
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Question

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While the legs are important for a runner's acceleration, the trunk and head actually account for 50% of this acceleration due to their role in generating torque and maintaining balance during running. The upper extremities are also important for balance and maintaining momentum, but they do not account for as much acceleration as the trunk and head.

What Part of the Body Accounts for 50% of a Runner's