I discovered this truth myself in my senior year of high school. Prior to that year I got through high school doing roughly no work outside of class and managed

I discovered this truth myself in my senior year of high school. Prior to that year I got through high school doing roughly no work outside of class and managed to get low A's in my classes through intellect. I also competed in track and field throughout high school somewhat seriously. However, in my senior year of high school, I ended up putting in much more time and dedication to track (as well as joining the cross country team, making it an all year commitment), so I spent an average of ~22ish hour/wk doing workouts related to that over the course of the year. I expected the little time I spent on school to drop to zero, however I was surprised that I was actually much more motivated to work on my relatively easy/unstimulating schoolwork. After working hard at running before and after school, it just felt unnatural to not work hard at schoolwork.