The focus of the people you have linked is about exercise in the context of a gym and diet is about calories. I would like to argue that being healthy and fit is not about the gym, or investing time in tracking calories.

Instead we should focus on daily fun movements that we like to do. So it doesn't feel like a chore and easy to maintain within your lifestyle. This could fall under different categories such cardio (walking , cycling) and some resistance training like body weight exercises. These are called Micro workouts, and can be done during the day. A great (nerdy) guy who is quite far on that path is the bioneer. https://www.youtube.com/watch?v=pWuKIlbybqY

And for food we should try to focus on whole foods and not calories and almost no-one should try to diet like a body builder prepping for a show. They feel terrible and you are priming the body to store energy in the fat cells. https://www.health.harvard.edu/staying-healthy/stop-counting...

Humans have been healthy for very long without the gym or calorie counting. Both are large time investments that can be better spent elsewhere