When I worked for a pensions company they sat me next to the CEO. He was a pleasant man most of the time, who could sometimes show a touch of arrogance towards his PA. I saw him mostly work at a slide deck all week and reading a book called Grit. Later I noticed he put a few sentences from the book into his deck. "We don't go home when we are tired, we go home when we are done" stuck in my head.
After a few years of my own struggles at being consistently productive my conclusion is grit is an emergent behaviour you cannot optimise for. You most probably want to use different words such as 'consistency' (this one works for me). I see grit as something opposite of health and balance. A short-term display of stamina that might trigger unwanted consequences in other areas of life.
Like a friend of mine who collapsed after, comparably, running a marathon when he had not fully recovered from the flu/covid-19 or something similar. He’s OK now though. He never bails out unless unconscious. He’s one of the most reliable persons I’ve ever known, and he has gotten where he wants to in life so it’s not necessarily bad.
After a few years of my own struggles at being consistently productive my conclusion is grit is an emergent behaviour you cannot optimise for. You most probably want to use different words such as 'consistency' (this one works for me). I see grit as something opposite of health and balance. A short-term display of stamina that might trigger unwanted consequences in other areas of life.