I completed two 420km marches and one maritime reconnaissance training during my military service... but it's all useless as I get older

Now that I'm in my late 40s,
nothing matters more than having good blood sugar and blood pressure levels, healthy joints, and maintaining muscle strength.
Still, there was a time when I completed two 420km marches,
and while undergoing maritime reconnaissance training, I had the stamina to swim 7.2km bareheaded in the waters off Gangneung..
As for running, my daily routine used to involve warming up with a 10km run in combat boots every morning, followed by single-leg pull-ups.
As I age, all of that becomes useless ㅠㅠ Now I'm just taking it easy and being careful with my body.
These days, I do short-distance running, strength training, and occasional hiking. I hope everyone takes care of their health...
.