I'm very pro-exercise myself, and there is no denying that exercise, athleticism, sports are celebrated everywhere and anywhere you turn, and has been so for decades. And it's not only the propaganda, everywhere there are gyms, yoga studios, sports halls and fields for a great variety of sports, running tracks, bicycle tracks, promenades.
Athletic clubs and sports clubs are a core ingrained feature of both rich and poor societies, and for all ages and abilities. Whether that is just playing a sport for fun once a week as a social activity, or serious endeavors for top talents aiming for Olympic gold or a pro career.
Any kind of sporting equipment you want or need are available for purchase, whether it's an expensive sport or cheap sport.
Athletes are celebrated and greatly admired, and top athletes can reach superstar celebrity status. As well as a big pay-check.
So I completely disagree that the "social infrastructure" encourages a sedentary and solitary life. The "social infrastructure" is very pro-exercise, pro-sports and pro-health.
> If your goal is to feel self righteous, keep believing the problem can be solved if people just get stop being lazy and join a club already.
As Prince sings: "Do what you want, nobody cares". Finding a physical activity that you enjoy is greatly beneficial for you. Whether it's a social sport, or exercises you do alone. You do it for yourself, not for anybody else. And everybody can find something which they like.
Righteousness has nothing to do with health or exercise.