My advice is that you should use your brains more and train less.
Running is not just a sport but a biological necessity.
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.
It is as if I can see my body in front of me.
When one runs 45, 50 or even 100km, for me, is not an ultra runner