Click PLAY or watch it on YouTube.
https://www.youtube.com/watch?v=1UOMuHMlbBM
Todd Gardner of IGI is featured in this 2011 video. Todd had 3 Quick Flex bars set-up simultaneously at his summer camp 2015 used mostly for Blind, Giant full, Tkachev and Shaposh.
Tumbl Trak originally got the idea from Al Fong.
Gymnastics Coaching.com 