Sit with your knees bent, feet flexed (just your heels touch the floor) hip-width apart. Place your hands behind your hips with your fingertips facing in. Pull your abs in tight and press down through your heels and your hands to lift your hips up into a tabletop position (your body should form a straight line from your knees to your head).
Lower and twist your hips to the left, tapping your right 'cheek' lightly on the floor, and then press back up to tabletop. Squeeze your glutes to raise your hips—the movement should not be coming from your lower back. Repeat 15 times total, alternating sides each time you dip.