Book excerpt: How much power does your human engine have? How much power do you need for running in different conditions? How can you optimize your training and racing performance? How can you use power meters to improve your results? What are the ultimate limits of human performance? The Secret of Running answers all of these questions. All factors determining the performance in running (from 800-meter race to marathon) are explained step by step: training, nutrition, body weight, running form, wind, hills, temperature, running gear, power meters and much more. Written in a crystal-clear and lively style, this book is a wealth of information for every ambitious runner. This title also contains brand new insights on how the balance of the power of your human engine and the power requirement for running in different conditions determines your performance. It shows how power meters can be used to optimize your training, running economy and race result. This book is lavishly illustrated and packed with useful data. Being already a bestseller in the Netherlands and Belgium, The Secret of Running can be considered the ultimate textbook for all serious runners and their coaches.