Inhale deeply and as you exhale, start to curl your body up, starting with your head, then your neck and shoulders, engaging your abdominal muscles as you go.
Continue to roll up, vertebra by vertebra, while keeping your arms stretched out in front of you, until you're sitting upright with your back straight.
At the top of the movement, reach forward towards your toes, keeping your back straight and your stomach muscles engaged.
Slowly roll back down to the starting position, reversing the movement and keeping control of your body throughout the exercise. Repeat the exercise as many times as recommended.