Begin in an elbow plank with elbows directly under shoulders, abs engaged toward the spine. Don't let the pelvis sag down or pop up.
Lift your left 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 left heel toward the ceiling as high as you can without moving your pelvis or lower back. The motion will not be huge but rather concentrated on the booty and hamstring.
Lower the bent leg slightly. This pulse counts as one rep.