As for David Goggins, I mostly agree, his level of drive is impressive at some level, but also just insane- he pushes himself to do things likely to cause permanent lasting injuries just because he can. It seems like he couldn't even get along with other Navy Seals, because they weren't disciplined and motivated enough for him, and wouldn't accept ideas like training to the point of serious injury or disability. But it makes zero sense- how can you be ready for a mission when you're injured? Ultimately, it seems like he's addicted to self harming to escape emotional trauma/pain, not because he's disciplined.

Jocko Willink is a similar "Navy seal teaching you the secrets to becoming a badass" but his approach seems a lot more sane and useful, and has been more effective in his own life.