I would recommend reading this article on Colin O'Brady. His "impossible first" wasn't exactly either of those things. https://www.nationalgeographic.com/adventure/article/the-pro...

I remember that article.

This podcast about the nutrition and planning for an unsupported 100 day crossing of Antarctica was absolutely fascinating but somehow felt nearly useless in terms of things to apply to my own (far far less substantial) trips. https://podcasts.apple.com/us/podcast/keto-2700-km-through-a...