Thanks for the replies. I am 43, btw.

Definitely not a grade 3. Can't tell which motion caused it, as I was sprinting at the time -- so not sure if it was the push off or the lifting my leg up, but I think it was the lifting/rasing my leg rapidly to take another step.

Had a compression wrap on it while I slept. Can straighten it to about 10 degrees of bend without much pain, then it starts to hurt pretty good. The act of sitting down is probably the hardeest thing right now -- once I'm sitting i'm ok, but getting there really causes some pain.

I would also agree that there is some muscle imbalance. Over the winter, my primary exercise is the gym on the elliptical and bike, and of course skiing as much as I can. Come spring I ditch the gym and most of my exercise is riding. I'll have to focus on strengthening my hamstrings a bit more.

BTW, I'm not sure what muscle it is....but I'd say it feels like it is directly in the center of the back of my thigh. Center from top to bottom, and left/right.

Thanks. No riding today...and it's a beautiful morning too : ( This is definitely worse than the pull I had two weeks ago on the other leg.