I was doing the E3 - Relaxed lunge from Master the Squat yesterday for the first time. After I extended the stretched leg, when I went for the C-R (try to drive the straight leg forward), I contracted the hamstring of the same, extended leg, which resulted in an immediate, intense hamstring cramp.
It's only on my right hamstring that a 5-10 second cramp would produce soreness and tightness for me, and for multiple days at that. The soreness and tightness feels like it's only at a very specific, targeted area in my hamstrings. This has happened to me before at the gym while doing TRX or valslide hamstring curls, still only on my right leg. Walking, self-myofascial release, and stretching seem to help it recover, but it is a stubborn sonofabitch.
Does anyone have any theories as to what is going on under the covers?