I'm on another David Goggins kick.  His content, story and delivery, to me is extemely motivational.  Whenever I listen, I see all of the life I'm leaving on the table...  Anyway, I was listening to him on and old Joe Rogan podcast episode #1080 and for a brief, probably overlooked minute, he talks about the time he learned about his Psoas.  

If you've listened to any of my podcasts before you know the Psoas is a third of my holy muscle trinity (diaphram and glutes being the other two).  Goggins talks about experiencing chronic fatigue type systems that were a mystery to his doctors but through stretching and releasing his psoas he was able to overcome those systems.

Have a quick listen here as we unravel how someone can experience chronic fatigue symptoms and fix through the psoas.