Still, to echo others, a student will do much better having regularly done at least modest exercise of some kind. In our school, I pretty regularly see students who are shockingly out of shape--and they seem to be concentrated in the computer tech industry. Again and again I get students with legs so weak that they can't get up after falling, without taking off their skis--sometimes even if I'm giving them a good pull and instructing them on which direction to move.Can't think of many outdoor sports that are less physically demanding than sliding around on a beginner hill on alpine skis. Sure if you struggle for many hours it will be exhausting, or if you want to take it to a very high level fitness can eventually become limiting. But it should not be an excuse to anyone who feel that they are unfit to not try skiing.
At the recreational level, good skiing is more about finesse than about great strength. But while receiving some great instruction from the trainers last season, I finally came to the point that I felt that my physical condition had become an important limiting factor on making progress. A milestone, I suppose. Or maybe I'm just getting old.