[jen729w]

I don't have one, but nor do I have a car. So the secret is: walk everywhere. Walk walk walk.

That keeps me 'fit'. I'm 49 and perfectly healthy, good weight, 120/80 bp.

I know I need to do more strength training but I'm not in a place (spatially) where I can do that.

Diet is of course a huge factor, but you didn't ask about that so while I'll allude to the can of worms, I shan't open it.