His first book is called Your Health, a corrective system of exercising that revolutionizes the entire field of physical education. I also read return to your life through Contrology. What were they like? Their bonkers. It's a lot of photos of him doing the exercises so that you can see how to do it,. Which makes a lot of sense. He claims that the detainees that he trained with in his internment camp, quote, ended the war in better shape than when it started.