STARTING POSITION:
Select the appropriate weight of the dumbbell. Stand straight with your feet shoulder width apart and grab the dumbbell with your left hand.
MOVEMENT:
Slowly bend your body from your waist to your left side until you feel the stretch in your oblique muscles. Inhale during the movement. Return to the starting position in a smooth movement while you inhale. Repeat the movement for the specified amount of repetitions and then repeat with the other side.
TIPS: The exercise key is quality over quantity. The trick is to perform the exercise using proper form.