I think this is called free solo. I have a friend who is an avid free climber but does use ropes in case of a fall to catch him.
Not sure but there all kinds of devices that are used .I was wondering about his technique. When he climbed up the length of one window unit, how come his shoes don’t slide on the aluminum?
Superb explanations, James! Much appreciated for the time and effort!
What about the challenge of climbing on aluminum with the risk of a layer of grease and slippery dirt or just perfectly smooth polished metal?