It's best to rest it.
I tweaked my hamstring when I was on vacation a little over a month ago (and it wasn't even from cycling). Anyways, I've been going to physical therapy for my knee so I told my physiotherapist about it and we've used "the stick" as well as the "Graston method" to break up the fascia as well as electrotherapy (and I think iontophoresis as well...but I'm now getting mixed up on what we did for the hamstring vs. just the knee!). We've been using kinesiology taping on the hamstring as well which has helped a lot for me personally (some taping patterns helped me more than others).
Even though I just tweaked mine and my physical therapist didn't say to stop riding or to take it easy (though I wasn't riding much a the time as I was taking a little bit of a break and transitioning between going from the road to the trainer), I'd be careful and rest it because mine, although much better, will still sometimes hurt when riding on the road/trainer.
Last edited by LivetoRide; 12-21-2010 at 12:19 PM.
"Limits are a state of mind: break them before they break you."
--Michael Cotty