You can download that freely or you can just read it there on the page. It is an old article by Bartitsu founder E.W. Barton-Wright called "How to Pose as a Strong Man", published in the January, 1899 edition of Pearson’s Magazine. It is basically a set of seven parlor tricks as outlined by the The Bartitsu Society's website.
Bartitsu, obviously named after Barton, is a self-defense and martial arts system out of England in the late 1890's. According to wikipedia it is mentioned in Sherlock Holmes as "baritsu" and it has experienced a revival since 2002…indeed, I see a number of websites dedicated to it, not only the one linked above.
Handbook of Sports Medicine and Science, Strength Training for Sport, by Kraemer, has an interesting and informative "brief history of strength trainng and basic principles and concepts" as its first chapter. The era of the strongmen mentions how many of the myths surrounding strength, to this day, come from the old-time strongmen, including the age-old myth that strength training will make you "slow and ponderous."