Not exactly my cup of tea. I have slack lined a bit in Camp Four and the Climber's Ranch ... but professional slack liners ... who knew!
http://c197913.r13.cf1.rackcdn.com/r7e2a3/mp4.mp4?t=142097883854b26a96cfa71
A bunch of old guys still enjoying the mountains, and the training they need to do to get off the couch