I guess I got a few climbing stories to add here. Wasn't sure if I would find the time when the thread was still alive. I got the same total respect for these guys as anyone, but I didn't seem to get any of the nervous effects people have reported from the video. I found it strange that someone would say that, but after several people said it, I guess I'm the strange one. I've done a bit of hiking & scaled some hairy sections of trail to get to peaks, clifftops & outcroppings. No mountain climbing though, but my technical climbing experience came when I was a tree planter in the Pacific Northwest.
With 300 ft. of climbing rope, a harness, climbing spurs & split flipline, I climbed 150 to 200 ft conifers to pick pine cones from the very top, on Government contracts with the BLM and US Forest Service. a 150' pine (in a forest setting) typically has no limbs at all for the first 50 or 60 ft. the diameter is usually around 3 feet across at the ground. After adjusting the length of the flip line & getting it around the base & clipped in, I could set my spurs, & move quickly up the tree in pretty fluid motion, like those lumber jack contests on a slow day at ESPN.
Anyway, the first tricky part comes after 50 feet. A lot of the lowest limbs are dead & I had a nice hardwood club I made, hanging off my harness & I could traverse around the circumference as I climbed, gradually planting each spur a little off center to the direction I needed to go, to end up with limbs on my left side. If I couldn't break them off, I used the split flip line. It was a steel cable lined 1-1/2" hemp rope with one long end doubled back over itself on the right D-ring, such that I could tighten in the length as the tree grew narrower during the climb, but the left side split to two 3' cable lined ropes with snap hooks for the D-ring, so I could climb until my waist was even with a limb on my left, remove one hook & get that half over the limb, clip in & get the other half over & then go on further up the tree. Eventually the amount of limbs got thicker & there was a lot of maneuvering around to get each limb on the left, but around 100', when the limbs got too thick... that's when the fun starts.
From around 100' to 186' (my tallest tree) it was free climbing, and then you get to the top 20' and the trunk is only 8 to 10" across... and I would tie off my 20' safety line here, because the top of the tree can break off from my weight... BUT, that's where all the pine cones are! At least the greatest concentration, which are also within reach.
By the way, before I forget, the views are totally amazing, because I drive through dense forest & have next to no idea what might be in sight. I've seen incredible wildlife, and the most amazing views... and I've also felt some serious swaying of the trees up at the top. I can honestly say I did not feel fear doing this job, except the time my snap hook gave a good loud snap, but it hadn't fully engaged the D-ring, and I wasn't looking as carefully to ensure a good connection. When I trusted my weight to it, it gave that extra inch with another "clink" and now I was safe... but that second of unanticipated "give", with an unusual clink sent chills up my spine!
So, anyway, if free climbing 150' up in a tree doesn't sound crazy enough, I would pick 40 or 50 pounds of pine cones in a burlap bag, tied to the back of my safety harness. now, free climbing back down, with a heavy bag leading the way below me, I'd have to choose the route, through which limbs, as I positioned the bag below, until I got to around the place where I switched to a free climb.
If anyone here repels much, the most fun part is here! I have to uncoil half of my 300 ft' of rope & set it around the tree. It will have to be dragged out again from the bottom, so the ideal scenario is 2 limbs opposite each other, and a third slightly higher limb on the back side.
Anyway, once the rope is set, I run it through my figure-8 friction device, & find the best straight shot down through the remaining larger limbs I couldn't bust off on the way up. Some of the ones I couldn't break with my club to save me using the split line, I would break with my foot after I got above them, to improve my chore of getting down.
The repel is awesome, kicking out from the tree & easing up on the friction, dropping 10 to 20 feet in each graceful kick.. man I need to go climb that wall at REI now... I sure miss repelling now that I think of it.