Older Yet Faster (OYF) is a manual for teaching runners how to transition to efficient running and help them avoid incurring almost all of the common running injuries as they do so. The book is ideal for beginners to learn how to run well, and for experienced runners to change over to good technique. Coaches can also use this book as a reference on how to implement technique change for their clients, and we expect it will become the go-to manual for medical and allied health professionals to help them deal with running-related injuries caused by incorrect technique and poor footwear choices. This book can also be a self-help guide for non-runners to heal common ailments holistically by following Heidi's treatment method.