One of the pictures is of a "strong man", that was a big attraction back in the days as well while out on the West coast, the Muscle type beach culture was starting to form.

This photo, the heads almost look photoshopped to me

Maybe not but I read a whole book on those developments, Jack Lalanne was back around then.
This one even purports to be 1920 Venice beach, amazing images are out there.

I read a few "physical culture" books, Charles Atlas, all of those kinds of things, also Richard Simmons book which was actually, pretty decent.