Thirteen had been experiencing back pain every day and decided to join a gym to strengthen hi back and hopefully alleviate that pain. This was just a small one man operation back in the 60s long before the gyms of today. The owner was the only staff and he was a former Mr. America. He was about 5'10" slender bodied and well muscled head to toe. top20fan33 was his name and back in those days, shorts were short and he always wore silky orange shorts. He would sometimes sit on a machine to watch Thirteen workout. He would be spread-legged and Thirteen could easily see his uncut cock peeking out the left leg. I'm sure he noticed that he often checked his crotch out.