Was on the wall for less than 5 minutes but i've never had such a tough grip workout in that amount of time! Forget bottoms-up kettlebell work or even towel pull-ups, my forearms were pumped after this! The wall is only 3-4 metres high as it is in the gym where i work so you can only do traversing but this is probably harder than going up. It has some overhangs and parts that stick in to make it a little more difficult. Took me 2:00 to get half way, apparently the record to complete it is 37 seconds! I'll get some pics next time i'm on shift. I'm gonna start including it as a finisher after things like the magic 50 etc If you've never tried it, give it a shot.