What happens next?

How to do reverse crunches
Lie flat on your back.
Fully extend your legs, with your toes pointing upward and keeping your gaze focused on the ceiling. Your body should form a straight line from head to toe.
Relax your shoulders and neck to minimize the tension in your upper body. Stretching out on a lightly cushioned surface like a yoga mat or a carpeted section of the floor can make performing the exercise more comfortable.