March 30th, 1970 David Paul Ryder, a twenty-two-year-old post-polio victim from the Battersea, London, UK, set out to walk across the USA on elbow crutches from Santa Monica to New York, total distance of nearly 3,000 miles, accompanied by three companions. The marathon was undertaken to bring attention to the medical profession and handicapped persons throughout the world, the benefits derived from horseback riding as a modern form of physiological...