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To move your body, your muscles need energy, and they need to be able to get rid of the residue left over from using that energy. All that transportation is done by tor blood flow. But when you push hard, your muscles can't get all the energy they need, and they can't get rid of all the waste either, and that's when you begin to feel tired.

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Q: If you run or ride a bike as fast as you can why do your muscles begin to feel weak?
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