hmmm, and I've been noting tightness in my hammies as well, especially the one I injured two years ago.
One of the trainers at the gym has taught me some exercises that isolates my hip flexors from my quads and stretches/exercises them. He said my legs are so strong that they are dominating both flexors and glutes so he is helping me learn how isolate/stretch/strengthen. Apparently my glutes are a little weak as well but not too bad.

