In Jiu Jitsu and in life that whenever something feels really shitty, you can just like take that thought and not think about it. Not think about being exhausted. Just, and that somehow relaxes you. I think maybe in the face of exhaustion, all the fears start to creep in. Maybe your muscles tighten up. This is for the amateur, just a person. But it's kind of funny how you can just taking that thought and let go of it.