That is a very interesting article! And it's something I've wondered about. Yes, I move when I go for a walk and go to the gym, but what about the rest of the time? I have a job where I sit at a desk all day. Also, when I go somewhere I drive sitting in a car, and in the evening I sit and watch TV.
You can see why the body wouldn't bother to keep the fat-utilizing enzymes going if someone is sitting. That would be a waste, since they aren't needed.
I do get up and move around frequently, but I think I'll do more of it!