I imagine most of us are in IT one way or another, which in all positions requires that we sit on our asses for hours at a time. Then, for amusement, we come here and sit on our asses even longer!
I spend a good 75% of my working life on the hoof, either lugging gear around, walking from problem to problem, trying to find the bit of kit with the unterminated thinwire, etc.
I really can't spend more than 25% of my time at my desk, and that's usually spent on the phone.
Peter [link|http://www.debian.org|Shill For Hire] [link|http://www.kuro5hin.org|There is no K5 Cabal]
even we full time delevopers have reason to get out of our chairs. Meetings, covering for the technicians (fix the user workstation, gather information to fix the problem), walk down to different departments that need different AD-HOC reports (Crystal Reports is your friend, now repeat it 15 times), talk to whomever is in charge of the servers and is giving the group "Everyone" read/write access and someone has been scribbling over my ASP and HTML pages that had workable code and somehow it got broken (Hey Boss, let's look at the logs to see who changed it last before you place blame). Well based on my old job anyway.