Twist exercise. From "The New Rules of Lifting".
Lihasgrupp: Abdominal
Sammud
SETUP: Lie on your back on the floor with your arms at your sides, palms-down, and your hips and knees bent 90 degrees. Your thighs are perpendicular to the floor and your lower legs are parallel to it.
LIFTING: Contract your ab muscles as you pull your thighs up toward your chest. The action is in your hips; if your pelvis were a pitcher of water (get your mind out of the gutter), you would be tilting it here, as if pouring the water into a glass.
LOWERING: Slowly lower your legs to the starting position.
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