In addition to being an engineer and a soldier, Jørgen Peter Muller was a Danish athlete who won 134 prizes across almost every possible branch of sports and athletics (125 of those were championships or first prizes). His famous workout, My System, has sold an estimated 2 million copies and has been translated into 25 languages. Muller also opened a prosperous institute in London and wrote a series of other books based on his system. Endorsed by doctors, kings, princes, celebrities (including author Franz Kafka), and fellow athletes, My System, is reported to have been one of the best selling fitness books in history.