Pretty cool that you're setting new PR's on the bike at 73. The Sugarloaf ride looked especially impressive. The only way I will set any new PR is to switch to a sport I've never done before.
So what will it be? I hear people who are good with racquets (as you are) rave about pickleball, but I'm not sure that sport has the concept of a PR.
Perhaps the answer is close to a sport you already do, I'm thinking of what the Brits call Athletics and we call Track and Field. More specifically, the Field part.
Javelin, Shot put, Discus, Hammer -- there's got to be a PR in there someplace.
Of course, we'll need to see photos...
Actually, you're about to PR on Saturday if you can just make it to the top of the hill. :-)
close to a sport you already do
Maybe "butt-sliding" aka glissading? Is that a sport? That's become the way I get down steep slopes in orienteering.
I remember a meet a long time ago, maybe 25 years, at Las Trampas in the East Bay. It was memorable because Las Trampas is a pretty nasty place with a lot of poison oak, and it was raining and I got some pretty horrible poison oak lesions, particularly on my lower legs, but what was really memorable to me was coming to a control on a spur more or less the same time as Wyatt, seeing the next control on the next big spur, but needing to get down a steep hillside and up the other side to get to it. So I started down, trying to control my descent, and suddenly Wyatt went sliding by on his butt at a high rate of speed, hit his feet again at the bottom and I didn't see him again.