I think it's not only about chilling on the weekends and weekdays being only about work but the lack of purpose and everything being "just about engaging" keeps us hooked 24*7
That includes weekends, most social activities are a result of our acquaintances doing sth who saw their acquaintances doing it. And those are never physical activities. Mostly it's either house parties, going to the movies or eating out
Weekends and weekdays become 2 disconnected pieces if there's nothing common in them, which is why the working days seem like forever
Doing things/hobbies which comes from your inner-self (and not because it's cool) and not because others are doing it would be real nice.
In general, moving more helps, as simple as drawing and as much as trekking a hill!
I think people going to the gym would have a different take on fast moving time if my theory is relevant because there is always a purpose to go to the gym which is being more fitter, however much fit you are right now, unless you have a crush you wish to see everyday (which is not a purpose but just a fantasy)