1. Stand straight with shoulders and feet wide apart and hold a dumbbell in your left hand.

2. Starting position: Place your right hand on your waist.

3. Now, keep your head and back straight and bend only from your waist to your right.

4. Inhale, and bend as much as you can and hold for a count of two.

5. Final position: Get back to the start position, exhale as you do so.

6. Now perform the similar steps bending to your left.

Reference : http://workouttrends.com/how-to-do-dumbbell-side-bends