why muscle is start paining during high time exercise ?
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Answer:
The pain is believed to result from the buildup of lactic acid in your muscles, which occurs when your muscles are not getting enough oxygen (anaerobic means "in the absence of oxygen"). This burning is not an indication of an injury but that you're reaching your fitness limit.
Explanation:
When your body is working at its greatest capacity, your muscles are not able to get enough oxygen to convert food to energy, causing lactic acid to be produced and built up in the muscle, leading to that burning feeling