So What is the Monkey Bar Gym?

We've had a couple of posts about the recently opened Monkey Bar Gym (2255 S. Michigan), but to be honest we've never really been able to wrap our head around what it truly is. After watching these videos via WGN, we have a better sense: The idea of working out like nature intended (not by isolating muscles with machines) is an interesting concept. Maybe we will have to try it out sometime. Has anyone been there? How did it go? (Hat tip: SoloMotorRow)