For fitness I’m obsessed with biking so I do like 90 minutes of endurance/tempo pace 5 days a week and usually a race once a week. Zwift is great with a Tacx when weather is bad (often).
That isn’t a time option for everyone but it is also likely well beyond what is necessary for most people.
I also don’t drink or smoke or vape which I think is important.
Not going to say I’m an expert or an exemplar of health but I am really trying everything I know to do at this stage.