David Martin took these images of Paul Larson. In the meticulous notes David kept on his models, he describes Paul as staying fit through "weightlifting, horseback riding."
When you jump to this post in the blog, you will see five photographs of Warren Newman, who I believe is the same model you see here.
I contend "Warren Newman" is a nom de porn likely derived from Warren Beatty and Paul Newman, two handsome movie stars quite popular at the time these series of photographs were taken. The images in the other post show a leaner man, but the similarities of their faces and bodies are too striking for them not to be of the same model.
