My dad is in his mid-70s now, and still swims 3-5 miles a week in the ocean currents and waves. He’s so active and so healthy, I literally have a hard time imagining what he’ll be like when he’s feeble.

15 years ago, we went for a hike at elevation and he actually kicked my ass despite being around 35 years older than me. Crazy stuff. That alone was enough to kick my ass into gear. Now I do sprints and lifting, and I actually enjoy it now that my goal is just “do something for health” rather than “reach a half-ton total across my big-3” or something like that.