Start out on your feet and hinge from your hips. Walk your hands out in front of you as much and as far as you can OR just to a plank position. Walk your hands back, standing up.
As you walk forward as well as backwards, focus on keeping core engaged so there's not to much hip wiggle side to side. Also focus on keeping shoulders away from ears in both directions; instead, use triceps and pecs to move as opposed to pushing through joints.