How Do We Encourage Habit Formation and Preparation for Cognitive Flexibility?

How should we encourage habit formation and prepare or train for cognitive flexibility simultaneously? The more habits you make, the more spoons you'll have to be creative in so many other areas of your life, right? There are trade offs. Am, this was another and a deeper one: Why are good habits like exercise so easy to quit, but bad habits like snack foods are so easy to maintain? I mean, part of it is t b, in advertising, they spend so much energy thinking of ways to make us addicted to foodsor even t b shows,. But that's an important part though, is how do we make exercising saya more valuable?"