[jspash]

"Big River Man" - https://www.imdb.com/title/tt0956101/

It follows Martin Strel a Slovenian long distance swimmer as he attempts to swim the 3000+ miles of the Amazon and chronicles his struggles with the sheer effort of the swim, his personal life and alcoholism.

You don't need to have an interest in swimming or sport at all. It's just a really well-made documentary with many layers.

"Valley Uprising" - https://www.imdb.com/title/tt3784160/ Rock climbing in Yosemite. The story begins innocently enough but as it proceeds through history of the climbs, it becomes more and more astonishing. Well worth a watch! Again, you don't need to be interesting in climbing at all. A good story is a good story.