Why do our bodies have an impulsive need to stretch after waking or sitting for a long period of time?

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Why do our bodies have an impulsive need to stretch after waking or sitting for a long period of time?

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to increase blood flow (blood flow descreases when we are stagnant)

increased blood flow is optimal for many reasons like oxygen & nutrient delivery to cells.

also when we are still for a while, fluid accumulates in the muscles . stretching moves it along