The short version was in that post. Longer version...

My BMI was over 33 and I was out of shape - huffing and puffing after not much exertion - in the summer of 2017.

I started tracking the calories, protein, carbs and fat in every single thing I ate. That's easier than it sounds because I use the MyFitnessPal phone app and web site. I made sure I was getting above minimum amounts of protein, carbs and fat and eating less calories than I burned (lots of calculators help with figuring that out). No special list of foods I can or can't eat, just my normal diet which I pretty quickly adjusted to portion sizes that allowed me to eat meals and a few treats i like. By march I had lost ~65 pounds and had a BMI under 25. It has not gone back over since and I am still tracking what I eat.

I started paddling SUP in the spring and paddled a lot, increasing distance and frequency through the summer. As it started to cool off, I joined Planet Fitness and have been going pretty regularly.

Somewhat related - I was drinking too much and gave that up 18 months ago.

So I turned 60 in the best shape I have been in since my late 20s.