Man, loving this great chat! You evidently really know your stuff 😁 I'm firmly middle aged at this point and am also just trying to keep bone density and general fitness up to be able to keep up with life! Not trying to win any competitions, just trying to be less sedentary!
I could never really get on with running unfortunately, I know lots of people who love the process but it's not for me. Which is a shame as it would obviously massively benefit me! Luckily I don't hate the gym so I've built it into my general routine. Still hard to get going some days though!