Merry Christmas everybody!! Got a question for about the last 3 weeks, off and on I have been having problems with my left knee. It a times hurts, but mostly it just feels stiff. This week since I've been off I have walked outside 1.5-3 miles plus about an hour of cardio in my gym, with no problems. My biggest issue is when I have been "resting" the leg, getting up out of a recliner/couch. Any thoughts? Is it arthritis? I don't understand how it can be no problem when I'm active but resting it stiffens up.