At RunMechanics we’ve observed some runners have an erect running posture with arched back while others end up bending from the hip. “Fall forward to Run” as the name suggests helps to lean from the ankle, get better hip extension, helps mid-foot landing, land close to the center of mass, and reduce overstriding.
This is a form drill to improve lean and to land closer to the body. So practicing this drill before your run as part of warm-up helps transferring the skill to your running.