[amatecha]

There's definitely a primal fear when you're 15-20m up on a rock where you feel like you have nothing to grip onto (or you're losing your strength) and you're going to fall -- even if you rationally know you'll be 100% fine, there's something you have to battle where it just "feels wrong" and you feel some kind of fundamental risk. The feeling tends to vary though, but it's quite common.

Also, yeah, it's definitely not for everyone. I only tried it out at 39 and am finding it super fun and satisfying/rewarding, so I'm all-in, but a lot of people "nope out" due to total disinterest after trying it!