Great full body locomotion drill with high load on lower body. May use chest harness or waist belt which makes it easier to reverse the direction of pull making drag hammer both sides of the legs. Load sled, position belt across top of pelvis – not stomach. Lean into load and drag sled with slow powerful steps. At the end of the drag, reverse direction and position belt across the rear of pelvis (not low back) and drag load backward to hammer the quads.