My brain is in pretty good shape. I mean, I'm not at 100%, certainly not by the end of the day, but I do pretty good.
I think the biggest area of improvement for me is in my mood-management: I get grumpy, by default, often. And I get whiny.
So I'm working on that. Mostly it involves saying what I don't believe, and then finding out that it's true after all:
PM: "Wanna do X, it'll be fun!"
My brain: "No it won't"
Me: "Sure!"
<30 minutes later>
My brain: "say, that WAS fun!"
And I worry about some folk near and dear to me who seem to have lost the fight against their brains, to their detriment.