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Alright, you got me... It's actually my strategy to get more work done during the day. As soon as someone enters my office they get this weird look on their face, turn around and make a run for the bathroom. My daily interruptions are at an all time low and my productivity is soaring. I plan to take the car to work one of these days so my boss can enter my office and promote me for my superior productivity
Just because you do plenty of exercise, don't think that compensates completely for sitting 8 hours a day! It does help of course, but you need to get up, take a walk. Work standing some of the time, and sitting at other times. Change things around a bit.
A bad back is pretty minor compared to some of the things you can get by sitting all day... like SO many of us do!
I'm 47, and don't drive. In spite of programming for over 20 years, I've just begun developing back problems in the last 3 or so (due to a fall-related coccyx injury). I put it down to lots of walking, cycling and casual exercise, integrated into daily life.
"If you don't fail at least 90 percent of the time, you're not aiming high enough."
Cycling does very little to work your back muscles, or any of your core muscles at all. Great for the legs and cardio in general, but a more comprehensive workout routine will go much farther in strengthening your core and addressing back problems.