HOW: Start this exercise on your back in a 90/90 position of your knees and hips. Keep the small of your back pushed into the floor by activating your core. While maintaining core activation extend your legs out one at a time towards the ceiling. The more you straighten your knees as you kick out, the more challenging this exercise will be on your core.
FEEL: You should feel the abdominal muscles engaging while you perform this exercise.
COMPENSATION: Do not arch the back as you perform this exercise.