Bodybuilder Charles Atlas, from an article on page 43 of the August 1925 <i>Artists and Models Magazine</i>.
Unknown photographer
<a rel="nofollow" class="external text" href="https://archive.org/details/Artists_and_Models_Magazine_v01n06_1925-08_2_pages_missing_Darwin-DrOldschool/page/n39/mode/2up"><i>Artists and Models Magazine</i> (Aug. 1925)</a> on the Internet Archive