Stand with the legs comfortably apart, and the feet parallel to each other.
Bend both knees and hips.

Start turning your body from right to left and left to right.
As you turn your trunk, shift your weight from leg to leg.
When you turn to look to the left, your weight is on the right leg.  When you turn to the right, the weight is on the left. 
Let all the movements start from your feet, legs and hips.  Do not move from your shoulders.

Let the arms freely swing as they follow the turning of the trunk.