Getting fit really helps, especially if you've never been athletic. I love cycling and have always done a lot of it, but COVID and WFH changed the nature of it. Instead of a "baseline" of bike commutes and extra sporty rides on top of that, it was all sporty rides. And while Strava reminds me that elite athletes can climb a hill over twice as fast as I can, and naturally athletic people in my age group are still 5-10% faster, it's still fun to try to beat my segment time up that hill and then it has knock-on benefits like better sleep, and even motivation to shed a few pounds because that too will help the hill climb time.
Markus