Here's a scanned-in copy of 1952's "HOW TO PERFORM STRONG MAN STUNTS." In addition to illustration that is so badly executed it practically qualifies for an exhibition of "outsider art" executed by chimpanzees, It includes such gems as:
How to Tear a Telephone Book in Halves
How to Tear a Deck of Cards in Halves
How to Drive a Spike Through a Board or Sheet of Metal
How to Bend a Heavy Steel Spike with the Hands
How to Lift a Man Overhead with One Hand
How to Smash a Rock with the Blow of a Fist
How to Support 1000 Lbs. of Living Weight with Ease
How to Lift More with One Finger than Others with Two Hands
How to Lift and Swing a Man with Your Teeth
How to Resist the Pull of Four Men
How to Break a Spike with the Teeth
Muscle Building Course & Abdominal Exercises
(via We Make Money Not Art)