Since I'm quite old (I watched the Apollo missions live) I have tried a lot of things and ruined various parts of my body doing them. And these days, life situations limit my options. But one thing that still works is to find a good tune, something that's randomly on the radio or high TV channels, and dance. Muscle memory turns it into an easy low-impact aerobic session, unless my body really doesn't want to move, and then I respect that and just vibe. One thing I don't do is hike. I get LAFD pings on my phone and every day they're helicoptering some idiot my age off the trail and over to UCLA Hospital.