Directions
Standing slightly bent over at the waist, with slightly bent knees, start with your hands about 6 inches above your knees, and lift the dumbbells up towards your armpits, keeping your wrists straight, squeezing the shoulder blades together. Lower your arms, staying in the bent over position, and repeat.
To support your back, brace/flex/contract your abs. Think of your "belly button trying to touch your spine".