
Two long runs ago, after 8 miles, I felt as if I ran any longer my hamstring would snap, and that is a scary feeling. I ended up walking the rest of that run. Then I remembered that this past year I had similar pain and it went away after I started stretching again. So, instead of running on one weekday runs I chose to go to the gym instead and after doing "arms" I did the hamstring machine:

and the squat machine to address this issue.

As far as stretches, I love doing the hamstring stretch using a counter.

and.....I also love the bend-over stretch using the same counter.
I am very sure there are hundreds that address these issues but these are MY go-tos when this pain resurfaces.