I'm sure this subject has probably been discussed here before but I didn't look through all the health topics.

My knees get sore after riding. They don't really bother me very much during the ride.......maybe a little after about 20 miles (I might have a little pain)..... but it's more about the soreness when stooping down and getting back up! That's when they hurt! Can anyone relate and offer advice on prevention?
Thanks in advance!