My hamstrings made night and day improvements after focusing my hamstring training around the High Incline Leg press, after reading a Greg Zulak article in Musclemag back in the late 80's about it. My quads and calves have always dominated, so was very pleased to find something that could get my hamstrings to respond where typical lying curls, deadlifts, etc gave me good strength gains, but not the balanced size I was hoping. I still do high incline leg presses for hamstrings to this day, but with much lighter weight (270 tops) and at a slow cadence, as my lower back is not like it was when I was 18. Best hamstring (and glute) exercise ever imo.