Here is the quick answer given by the ortho doctor that replaced both my knees. The older you get, your body hydrates your ligaments and tendons less. You send endorphens to them when you use them that loosens up everything, however when you settle down and rest with little movement, those ligaments and tendons dry out resulting in tight muscles and stiff joints. The body responds to that with minor aches to make you aware that you need to slowly loosen them up before jumping back into rigorous exercise. The answer is to stay hydrated with water, amino acids and or electolites. These all help, but you are still going to be a little stiff and sore. It never gets better until, and thats not better.
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