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noname [10]
3 years ago
7

Why is running so hard on the body

Health
1 answer:
AleksAgata [21]3 years ago
3 0
It's caused by a buildup of lactic acid, but is really a signal your muscle is using to let your brain know it's running out of energy. Eventually, you'll build up enough endurance that your muscles won't freak out so soon.
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