I have what feels like a perpetual pulled hamstring which hurts most all the time -- sitting, standing, running, etc. -- at the bone at the bottom of the left buttocks. It's s dull persistent pain. On top of that occasionally when I begin running I get a pain with each step starting in both buttocks and resonates down my legs. It calms down somewhat during my 3-mile run. Recently I've had another problem which I think is somehow related. When I start my run most days, my front thighs hurt almost to the point of not being functional. I have to gut through it for about a quarter mile at which point, though they still hurt, there is some relief. By the time I've completed my 3 miles I can still feel it but its very tolerable. When I stop running everything is fine except i still have that pulled hamstring-like pain. Any ideas?