In this workout, you’ll build strength in the lower body and core, beginning and ending with invigorating stretches to help improve your flexibility and overall mobility. This routine was designed by Pete Egoscue, author of the Pain Free book series and postural therapy expert with 40 years experience working with patients and athletes. (You can learn more about Pete and his method for healing here.) This routine works your body from the ground up: Start with the legs, move to the core, engage your arms, and then use the ground as a strong boundary for even deeper sensation in the legs.