Your follow-along video is on its way.Until it arrives, follow the four frames below and the steps on page 59 of your book. Nothing to install, nothing to sign up for.
Why it helps: It loosens the backs of your legs, which often tighten from sitting and can pull on your lower back.
Practice safely. Read Part 2 of your book before Day 1. Move within your comfort, and stop if you feel chest pain, dizziness, shortness of breath or sharp pain. This is not medical advice.