The easiest way to keep a habit is by doing something you enjoy. Of course this can be hard in the case of eating healthy, if you would rather just eat shittier but more delicious food. But for exercise, finding an activity that you enjoy makes it so much easier to stick to it. I used to play rec soccer and enjoyed it so much, and ran multiple miles per game without even thinking about it because I was so immersed in the play.

Now I do a lot of rock climbing which is a full body exercise and some hiking to get to locations, with the added benefit of being outside in beautiful nature.

In short, find things you love doing that align with your health goals.