Title could be enough. But since this question is so simple that it looks a bit absurd or obvious...
Unlike many questions out there in this site, I'm looking for fitness (rest included) in the health sense, in opposition to aesthetics or body improvement.
I'm not talking crazy here in listing these examples, which I believe are world wide common sense:
Eat at least 3 meals daily: breakfast, lunch and dinner. I'd bet most languages even have those 3 separated words to describe each of those meals. If not, they certainly do have this concept.
Have around 8 hours of sleep, every day, despite recent studies.
Brush and floss - rinse doesn't matter.
Wash your hands (notice bath isn't required daily - not world wide at least).
Question here is: what else is there? Sunscreen, maybe? I'd like to know what is, today, considered consolidated things that every single human being should do daily to maintain good health - including nutrition and even, eventually, exercises. For any age or size, if that wasn't clear.