I'm 25 and am definitely feeling its effects on my body too, as well as longing for the outdoors. It's worse because I know the damage I do from sitting around

I'm 25 and am definitely feeling its effects on my body too, as well as longing for the outdoors. It's worse because I know the damage I do from sitting around means that I need to spend more time actively counteracting it later through stretching, etc., instead of it being built in to the day, like it would be at a more active job. It just takes a little effort to do it sustainably. For a couple years I never drove my car, instead pedaling around the city enjoying the breeze every morning and afternoon, because work was a 25-minute bike ride away. But now that I'm working from home, I have to make the effort to get outside or work some kind of movement into my day, and it's still entirely up to me to do. Realizing how much better your body feels after running or biking or whatever physical exertion you enjoy can really help. Having a dog helps. Having friends around who like to constantly get outside helps too. You just have to remain vigilant about it, and grab any spare moment of the day to do something with your body other than transcribe code. There will always be improvements you can make to software, but just a little extra activity for your heart and muscles fixes a surprising number of physical "bugs."