– Why do we have the reaction of tensing our muscles when it’s cold? Does it actually help us to stay warm?

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– Why do we have the reaction of tensing our muscles when it’s cold? Does it actually help us to stay warm?

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Yes. Using your muscles, like tensing or shivering, creates warmth. If you workout, your muscles will feel warm after, they use caloric energy to work and heat is a byproduct of that work.