Thomas Lennon shot this week's image in 1936. The buff subject was 42 years old at the time. Known as Don Athaldo, he was an Australian strongman and physical fitness advocate who was born as Walter Joseph Lyons.

The glass plate negative of this photograph is part of the Powerhouse Museum's Photographic Collection and has no known copyright restrictions. For a lot more information from Flickr on what that means, exactly, see The Commons page.

Once you're on The Commons page, prowl around the collections of the 27 institutions that participate in it, which include the New York Public Library, Smithsonian Institution, and Bibliothèque de Toulouse.

You can see all sizes of the image at http://www.flickr.com/photos/powerhouse_museum/3857773310/.