so back when i was about 17 (20 now) i pulled my left hamstring pretty bad during high school track. never got around to even sprint in one meet. since then i havent done much in the area of physical activity, which led to my inflexibility left leg. i can sprint (run) hard but afterwards i can feel my hamstring getting tight which then i try to stretch it out and massage it. recently ive taken cycling to heart and i noticed that my left knee would get a lil sore while my right knee would be perfectly fine. i am thinking my hamstring injury is has to do something with the soreness in my left knee. i have bought a messaging ball and stick to try to get rid or loosen up the scar tissue. i am goign to stretch often because i really want to get into racing. i miss competition. what do you guys think? probably should have gone to the doctor and therapist a long time ago.