An exercise for the abdominal muscles.

Lie on a gym mat on your back with your feet drawn towards your bottom, and your arms on the floor by your sides. Adopt the Neutral Spine Position and maintain it for the duration of the exercise so that your back remains flat on the floor. Do not let your back arch at all during the exercise.

Raise both your legs to a vertical position, straightening them as much as you can. Keeping one leg vertical, slowly lower the other leg forwards until your heel is just above the floor, then raise it back to a vertical position. Repeat with the other leg, again lowering it to the point just before your heel touches the floor and then raising it back to vertical.

Keep the small of your back flat to the floor by keeping your core muscles tight.

When you have finished the exercise lower both legs to the floor bending your knees as you do so.