A friend reminds me that I started getting healthy and fit after I attended a science fiction convention in around 2007, and saw that a third of the fans in attendance were using mobility scooters. I saw that for my own not-too-distant future if I didn’t lose weight and start exercising.
And so I did.
A few years after that convention, I attended another and was satisfied when I climbed a short flight of stairs two at a time.
That’s not something I’d do today. My wind and muscles would be able to do it easily, but my knees would protest.