Swimming is the easiest for me to do - I find the rhythm soothing and I like being away from any technology so I can just think or focus on the swimming.
That's my plan when Win10 gets too old. I've run Linux before (although not as my daily driver) so the only thing worrying me is choosing which distro...
I've been using AI summarisation for things like this so I don't need to read and I can satisfy my curiosity (normally what film they're talking about). Normally it's not worth the effort but it's quicker than reading the article myself.
I think some really general-purpose communities like films or books are good to be one per large instance, as they'll be busy enough to have plenty of content without them getting so big you have that Reddit thing where it feels pointless trying to contribute unless you're early.
Smaller, more niche communities definitely are harmed by being spread out as they get too quiet to survive.
I like an eyemask too, although I tend to only use it if I wake up too early and want to go back to sleep - it's too hot to keep it on all night.