The heel touch and hamstring curl exercises involve the hamstrings as the primary muscle group and the glutes as the secondary muscle group.
For the heel touches, lay flat on your stomach and lift your legs off of the floor. While keeping your legs in the air, bring your heels together and repeat for 3 sets of 10 reps each. Give yourself 30 seconds rest inbetween sets.
For the hamstring curls, lay your legs back on the floor, and then lift your calves up and down. Repeat for 3 sets of 10 reps each, resting 30 seconds inbetween reps.