This exercise is great for your abdominal muscles.
Keep your arms straight down at your sides. Your feet are just off the floor. Bend your knees at a 60 degree angle.
Roll your pelvis backward to raise your hips of the floor. When rolling your pelvis backward, use your lower abdominal muscles. At the highest point of the exercise, your legs will be over your chest. At that point squeeze your abs and slowly return to starting position with your knees bent and your feet