Imagine they even would have opened the windows to get some fresh air. 

 Of course. 

 Yeah.. Life becoming more sedentary and then we have to worry about fitness. 

Even a 2 hour workout and 22 hours sitting / sleeping split is probably not that good. 

 Yes, incedental activity throughout the day would be more normal, but a lot of us have desk jobs. 

 Men also seem to be developing a taste for very thin women. Perhaps trying to start off at a deficit, so that her added-fat doesn't cause her to later be as big as a house.

Women used to just go up a dress size and look a bit plumper. 

 It's been rather strange watching most of the women who were narrower than I become wider.
I always felt so humungous because of my heavy frame.

But I just stayed that way. 

 Our civilization is becoming is more digital and less physical. Whether we like that or not is a different matter. We should at least be open minded to a range of possibilities. And physical excercise is ofc still crucial to live a good life.