Weird, I can jump from 19m from mountains during summertime but I think this walkway that high up might cause my "fear of height" neurons to kick into action. This is from someone who does flips and such all the time from 10-13m outside. It is the same when jumping from bridges, I almost cant do it because it is way scarier than following a mountainside down.,(reply>), If i had to guess, its the buildup as well as having something to judge the height by, like the cliffside. Here you have a slow walk over to the pool. Also as things get smaller the further we are from them, compared to a lake or ocean the pool looks small so maybe theres a fear of hitting the bottom or not landing in the pool at all? Maybe its the fear of falling earlier than you want to off the scaffolding, or that the environment is so much more sterile and unwelcoming than a bright sunny cliffside,(reply>), I used to snowboard and skateboard. I've been off big air jumps that give you an easy 15m of height from the ground and was fine, but if I had to stand where Tom was and film, I would need twenty harnesses and my legs would be jelly.<br><br>Same thing with rock climbing, I can hang off a cliff hundreds of metres up, but put me 10 metres up on a diving board and my heart is pounding through my ribs.,(reply>), I definitely agree about the perception of height/danger being very different from the actual height. I can sit next to the window on an airplane just fine (and in fact really enjoy the view) but a simple staircase with the wrong kind of railing makes me nervous. To misquote Pratchett, I'm not afraid of heights, it's depths that are scary!,(reply>), I made the exact same experience!<br>I'm a rockclimber so I absolutely don't mind climbing up a wall to 15m and jumping down from it. I do it every summer, 5 to 6 times in a row until my body starts to hurt. As long as I can use both my hands and feet to hold on, I have no fear even on higher routes, where you are not jumping obviously.. But on jump towers and such, I get the weirdest feelings before jumping down, even if its just 7-10m. It only happens at man-made structures. I think it has to do with the fact that concrete levels don't have anything underneath them.,(reply>), I don't jump off anything, but I have a similar condition: I can climb mountains and trees with ease, but I'm horribly afraid of heights when on man-made structures, like bridges, lookout towers, balcony above the fourth floor, etc. I climbed the cliffs at the Côte Bleue near Marseille without too much of an issue, but I couldn't bring myself to get up a canopy walkway a few weeks later.<br>I reckon that means that my fear of heights actually stems from trust issues.