Hi i'm an 18 yr old senior that has had alot of problems with my hamstrings in the last two years. the doctors don't know why to be exact. i had surgery two yrs ago and it didn't do any good. i have torn my left hamstring eight times in the last two years while sprinting, and playing football. i have done almost everything that i could by stretching, taking vitamins, wearing compression shorts, and by icing it to the bone. i dont' know what else i can do to atleast keep it from tearing. any help would greatly be appreciated.