Stiff knees can occur for many different reasons including arthritis, a sprain, a strain, or any other knee injury. These stretches should help. More knee stiffness treatments: https://www.youtube.com/watch?v=ZT85Ju0DuyU&t=0s&index=8&list=PLPS8D21t0eO-Ab_0ywWDTQHflRx8eHcCC Doing patella (kneecap) mobs is a great
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