Muscle pain

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When squatting for a long time, the legs hurt in the part above the knees. It's hard to get up straight. Lasts a couple of seconds. Why is this happening and how to solve the problem?

When squatting for a long time, the legs hurt in the part above the knees. It's hard to get up straight. Lasts a couple of seconds. Why is this happening and how to solve the problem?

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