Look, you can't expand your ribcage. It is not possible. Maybe a young teenager could conceivably stretch the costal cartilage a tiny bit. I even doubt that; or as mentioned if you have Polycythemia, which I hope you don't. This is one of those myths that gets perpetuated like lowering your biceps insertion with preacher curls and shit like that. I'm not knocking you, I'm just affirming that yes, that article, which is 90 years old or so, is basically bullshit.