More like real life: the post.
You'll understand when you graduate. When you start working full time, you don't really have much time for hobbies, especially if you add a basic fitness routine into your schedule as well.
And that's if you're working a typical 40 hour a week job with no kids. Running your own business or working 60+ hours in finance/software/consulting? Have a kid? Fucking forget about your hobbies. The only thing you do now is work, lift, do chores/errands, and sleep. You have no free time.