The first time you do a big stretch in the morning or when you haven’t in a while and it almost freezes you for a few seconds… why does this happen??
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Most people are relatively still when they sleep, so muscles can get somewhat stiff or tight. That first stretch brings lots of additional blood flow to the muscles. With that, it also recirculates fluids that may have built up in or around the muscles during the your rest. (Blood, lactic acid, etc.)
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