Start lying on your back with your knees bent and feet flat on the ground, hip-width apart. Press your back flat against the ground and rest your hands on the ground by your hips. This is your starting position.
Push through your feet and squeeze your glutes to lift your hips toward the ceiling, keeping your pelvis level and your abs pulled toward your spine.
At the top of the exercise, pulse your pelvis up a couple inches toward the ceiling, then back down a couple inches. Repeat for 10 pulses.
Lower your hips back down to the starting position.
This completes one rep. Repeat for 20 reps, doing the pulses after each rep. Take a short break, then repeat the set for three rounds.