Andrew Huberman's Interview of David Goggins, Doing Hard Things + Strengthening Your Mind.

The conversation between Andrew Huberman + David Goggins about doing hard things and how once you do them, you effectively get better at doing more hard things as a specific area of your brain grows is something else.
If you want to jump right to that specific part of the conversation, it's 45 minutes and 55 seconds in but I'd recommend listening to the build up, for sure as well as David's reaction.
Link below in the comments to the podcast.