This move combines a little Pilates and a little kickboxing to really challenge your abs and arms.
How to do it: Start sitting up on the ground with your knees bent, feet flat on the floor. Place both hands behind your hips on the floor, fingers pointing in towards your hips. Lift yourself a few inches up off the floor with your arms and bend your right knee into your chest, flexing your right foot and drawing your abs in tight. Next, push out through your right heel and extend your leg into a front kick (right leg should be level with your left) while you lift your hips up as high as you can, looking up at the ceiling with your eyes. Repeat 10 times with your right leg, 10 times with your left.
Bonus tip: Avoid excess pressure on your wrists by focusing on pressing your palms and fingertips evenly into the ground and thinking about lifting your abs up and in as you move back and forth.