Step 1: Lie with your back on the floor and with your palms facing down. Bend your knees in towards your chest.
Step 2: Raise your hips off the floor and crunch your knees inward. Reach towards the ceiling with your toes.
Step 3: Pause, then slowly lower your legs and roll your back down until you are back in the starting position. Use your core muscles to lift; avoid rocking back and forth. Repeat this as many times as you can in 60 seconds.