You're an arrogant one, AzN bio. :-P
But out of all seriousness, I do understand where you're feeling 1st hand. When you are more active overall, you feel what natural posture and energy flow is supposed to be.
When you sit, you notice that your posture doesn't feel "natural"...because it isn't. You feel the pressure on your obliques, abs, and lower back, as well as your back and neck, and you feel lethargic. You feel the pressure on your back and hips, and it doesn't feel "natural", as if your energy flow is disrupted (because it is!).
I remember back in the days years ago back in my dorm years of college, when I would be content sitting and laying down (playing video games, watching TV, on the computer, etc.) for most of the day if I had nowhere to go.
Now...im definitely more antsy. I can't sit down in one spot for too long. Sometimes I eat standing up. Even when I am on the computer, I rotate between sitting and standing.