http://ift.tt/1JtLXfG For lower body movement, the power from the abdomen and back is transmitted through the pelvis to the legs. Visualize that the pelvis is an extension of the leg. To take a step, use the abdomen and back to lift the pelvis, which in turn lifts the leg. Move the foot forward and stretch the pelvis downward until the foot is fully planted. All of these movements are internally driven with the upper body remaining still. Then, the foot will pull the body forward to complete the step.
via YouTube https://youtu.be/j_D5g0z1lQ4