Lie on your back with one dumbbell in each hand in front of your chest. Extend your legs straight toward the ceiling at 90 degrees, or to make it easier, bend your knees or rest your feet on the floor.
Inhale and press your back into the floor. As you exhale, brace your core, crunch up, and lift your shoulder blades off the floor. Lower your legs toward the floor until you feel your abs engaged. Hold this position. If this is too difficult, don't lower your legs toward the floor or omit the crunch.
Reach the dumbbells straight above your chest, and turn your palms to face your toes.
Take an inhale, then lower your elbows to the floor, keeping them wide and in line with your shoulders.
On your exhale, press the dumbbells up. This completes one rep.