I play both Star Citizen and DRG without any issues on Linux (I use Arch btw).
For Star Citizen you need to run the installer through a compatibility layer like Lutris, but then it should install and work fine (though I haven't played in about half a year, so more recent changes may have broken things). For DRG, I just installed through Steam. I don't even think I'm using GE or anything and just running it native.
As someone else that doesn't go to a gym, it is a combination of: they enjoy working out or do so for another reason, they don't have the space for gym equipment at home, they can't afford to buy and maintain the gym equipment they want to use, the gym they attend offers classes or personal training guidance, they enjoy the atmosphere and encouragement of working out with other like-minded individuals.
It isn't something magical, it may just not be for you.