Sit with your knees bent, feet flat on the floor hip-width apart. Place your hands behind your hips with your fingertips facing forward. Use your glutes to lift your hips off the floor. Extend your right leg out straight, squeezing your inner thighs together so that your knees stay in contact.
Bend your elbows to lower your hips just above the ground, and lift your right leg into your chest (keeping it as straight as you can). Press back up to the start position. That’s one rep. Do 10 reps with the right leg, 10 with the left.