Sitting all day is widely considered a privilege and a preserve for the educated folks. There is this unwritten rule that students study hard so that in future they will get white-collar jobs and will not have to sweat much to make a living.
All they will do is sit in a nice office, make phone calls, sign documents and work on the computer all day. As one witty writer once pointed out, a big man loves to sit down and get big.
You do not wish to be a factory worker, who bends a lot, lifts objects and walk up and down until the end of the shift.