When I was having a careers chat at school in the late eighties while expressing my interest in becoming an Air Traffic Controller, the careers lady told me I had to have good physical fitness. Of course I knew this already as I'd researched the subject quite well. Through the ensuing conversation it became apparent that the reason she thought one had to be fit was because one spent all day on one's feet................??????????
It turned out she'd been watching one too many Battle of Britain films, and thought I'd be pushing models of 74's and TriStars across a large desk top with a large wooden stick!
(PS I didn't achieve my ambition, but never mind.)