Without patience, you will never conquer endurance.
Like a tree that grows stronger with more branches and roots, you need to find more and more ways to be inspired.
My advice is that you should use your brains more and train less.
When one runs 45, 50 or even 100km, for me, is not an ultra runner
It is as if I can see my body in front of me.
Running is not just a sport but a biological necessity.