Lie on your back with your feet on the floor and knees a hips width apart.
Straighten your knees a little and lift your toes.
When ready, push through your heels and lift your hips from the floor.
At the top of the movement, you should have a straight line between your shoulders, hips, and knees.
Hold this position.
You can increase the difficulty of this exercise by straightening your knees further.
