Riding an electric skateboard up and down the hills of San Francisco was one of the most dangerous and exhilarating things I've done, and was only made possible by the years of skateboarding and snowboarding experience I was lucky to have. I completely agree with your take, it was akin to a full day of snowboarding in terms of the athletic load it put on my body, and constant danger I seemed to be in. There are so many opportunities to hurt yourself and only a few ways to safely navigate the random situations you encounter. I'm glad I got out without serious injury.