Question

Do you feel your muscle get tightened while performing a physical activity ? What
could be the reason for it?​

Answer 1

Answer:

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Explanation:

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Answer 2

Answer:

During Exercise

But why exactly is it that our muscles stiffen up when we exercise? The short answer is that it's down to our muscle fibres, which expand and contract when we move our muscles. Muscle stiffness can occur during exercise when the fibres contract, seize up, and have difficulty expanding again.