>is there a different exercise other than the glute raises
>that works the "insertion" where the hamstrings meet the
>buttocks? I can feel these throughout my whole leg, not just
>the target area. Is that normal?
>
Yes, that's normal. You can't contract just part of the hamstring or glute, so the whole muscle contracts.
Another effective exercise for that area, IMO, is donkey kicks. On all fours, with an ankle weight on (optional) raise one leg to parallel with the floor with knee kept at 90 degrees. Lots of variations on it, like going from bent leg at the bottom to actually kicking the leg out, pushing throught the heel; or crossing the knee over the other one at the bottom; or doing pulses or other rep variations like 1 up/3 down, etc.
I wish Cathe would put more of these in her workouts. When she has, they seem to be very minimal.
The earlier Firm is good at doing floorwork that hits this area. "Sculpted Buns, HIps and Thighs" is all floor work (but should be called "Scuplted buns and abs and hips and abs and thighs and abs" because there is a lot of ab work as well). Whenever I feel like my bottom line needs some extra work, I like to get this DVD out.
If you do some of these floor work exercises before doing moves like squats or deadlifts or step-ups (what Cathe calls a leg press, which also hits that area, especially, it seems to me, if you "dip down"a bit before pushing up through the heel of the foot that is on the step), you can pre-exhaust the ham/glute area, so when you do these other compound exercises, that area can be worked closer to failure.
If you are having back pain when doing bent-over rows, try doing 1-arm rows with your non-working hand supported on the high step (or seat of a chair). Doing these with a barbell requires a lot of lower back strength.