373. Mind and Body?

This fitness physical system was designed by the German gymnast Joseph ______ during the First World War as a method to improve the rehabilitation program for the returning war veterans. The exercise regimen was based on the idea that the functioning of muscles is controlled by the mind and hence, he termed his method as Contrology. But today the method is known by the founder’s last name. Which is this one of the most popular fitness programs am I talking about?