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Jumping with one arm up can enhance vertical leap due to the principle of counter-movement and body dynamics. When one arm is raised, it can create a more effective balance and rotational momentum, allowing for a more powerful upward thrust. Additionally, the focus on one side of the body may engage core muscles differently, contributing to a more explosive jump. Overall, this asymmetrical positioning may optimize the body's mechanics for jumping.

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Q: Why can someone jump higher with one arm up than with two?
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