Begin in an elbow plank with your elbows directly under the shoulders, abs engaged toward the spine. Don't let the pelvis sag down or pop up.
Lift your right leg off the ground, bending your knee so the sole of your foot is toward the ceiling. Keep your pelvis square to the floor. Don't let your pelvis twist.
Press your right heel toward the ceiling as high as you can without moving your pelvis or low back. The motion will not be huge but concentrated on the booty and hamstring.
Lower the bent leg slightly, and continue pulsing.