When I started Gym Jones we made a lot of our equipment. Well, Mr Pink made it. He made the boxes we jumped onto, the "Blaster Bars" we carried and held for grip strength, the medicine ball targets, and helped install the climbing wall. His crowning achievement, IMO, was "The Punisher", a 4" in diameter pull-up bar mounted in ball bearings. Sure, it was designed to develop grip strength but the unintended consequence — and why I loved it so much — was that it prevented kipping. As soon as a trainee started air humping to gain momentum the spinning bar spit him off. It was glorious.