I often kid with people that I save weight on my bike by riding without a seat. Now that I’ve seen this, I hope it’s not something that ever becomes a reality. Norwegian, Kurt Asle Arvesen, had a saddle failure at some point in his race, but instead of giving up, he simply stood up! 20km is only 12mi, but that’s a long way to go without the option of sitting down.
By the way, you can tell he’s spent more time in the saddle than out of it, because he looks a little out of his element constantly standing. Maybe a year on a high-geared singlespeed would be a good training option?