[lc9er]

I'm a big fan of strength training, but think it too often gets suggested as the solution to every problem, when really, we need some mix of strength training, cardio (anything from walking, to martial arts or team sports, whatever you'll actually do), mobility, and balance training. Your cardio/activity, depending on your choice could, account for a lot of this.

[nottorp]

The greatest leap is from not doing anything to doing something.

So just any activity will do, as long as you like it enough to do it regularly.

The rest is refinement.

[Hoodedcrow]

I chose aerial gymnastics because that seems to be a combination of ALL you mentioned.

[m463]

the book goes into that. Decent book about getting old, and not having to.