WHY: This exercise is great for strengthening the abdominals.
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 drop one leg towards the floor. Do NOT let the back arch with this exercise. When lowering your legs bring one leg down at a time to avoid stressing the low back.
FEEL: You should feel the abdominal muscles engaging while you perform this exercise.