They don't really hurt, they just ache a bit. On weekends I like to either walk 12 miles into town and back or hike 7 miles through the snow and when I come back my right knee and hip ache slightly. It isn't enough to actually stop me from walking but I want to walk across Iceland this summer and I don't want to seriously injure myself. I wear hiking shoes when I go out and I'm 25, 5'6 and 135 lbs with 21% BF.