1. Lie back onto floor or bench with both knees bent and feet flat. Place hands at sides.
2. Contract abdominal muscles continuously to stabilize trunk (or tuck stomach in by drawing naval in towards spine). Lower back should be in a neutral position.
3. Start position: Straighten both legs so that they are perpendicular to floor.
4. Slowly bring legs out away from each other and then return to side by side.
5. Return to start position and repeat.
