I guess the one thing I would have done, is get fitter earlier. Too much of my time has been lumbering. I need to lose more kilos.
I hear you on that one. It's amazing how it sneaks up on you, then suddenly you've got a battle to get rid of it, and the older you get the more stubborn it is about leaving.
I would change a lot of stupid shit that I did when I was a teenager but a lot of that stupid shit has lead to my current life which I am rather happy with (except for cancer and kidney problems)