Magic
Digestion of iron. You do the shit you need to do even when doing it makes you feel worse in the moment, because you feel better for having done it. There's no joy in the doing, only in the having done, but you can't get the joy of having done without doing. Hydrate. Eat your veggies. Get a walk. The mind is what the brain does, and the brain is an organ and needs to be treated as such.
Tired. Sore. Exhausted. Better.