I'm reluctant to be this commenter, but this honestly reads like "sky is blue" kind of thinking.
Worse: it is likely that nobody knows the "best" formula for physical-activity-unto-staying-young. Think about how difficult a problem this is.
And even if there were a plausible, scientifically defensible answer in terms of the effect of specific routines on a sample population, it's still very difficult to generally apply it.
There's room for good common sense here: do what makes you feel good, what seems to increase your fitness, and what you can do without causing serious injury.
Worse: it is likely that nobody knows the "best" formula for physical-activity-unto-staying-young. Think about how difficult a problem this is.
And even if there were a plausible, scientifically defensible answer in terms of the effect of specific routines on a sample population, it's still very difficult to generally apply it.
There's room for good common sense here: do what makes you feel good, what seems to increase your fitness, and what you can do without causing serious injury.
Right?