I'm a 50ish BOPer and I'm doing my first IM in a month. My problem: on long runs, and the run part of long bricks, my hamstrings are my "limiting factor", in that they get so tight and painful. I had lower spine fusion a long time ago. Other than some stiffness, it doesn't bother me, but it might effect my hammies.

So, do any of you stretch during races? Any ideas on how to keep the hammies loose? More salt? Tylenol (although I posted earlier on Aleve and got some pretty strong opinions).