a lot depends on how you sit. I used to use a special ergonomic chair that
forced me into the right posture, and that helped a lot. However, O know of one fellow who just slouched in his chair, and when he complained of back problems he went to a chiropractor and the issue turned out not to be sitting in his chair like a lout all day, but because he rode to work on a push-bike.
Like all the wannbe fitness nits, he got himself a push-bike just like they use for road racing with the low bars etc. Well, they're designed for the rider to be leaning over almost laying on the crossbar to reduce resistance and they only look at the road a few feet in front of the front wheel, which is why so many crash when they have a crash, no one looks that far ahead.
Well, in riding in traffic he has to have his head up and looking about, the result is this hurts his neck a lot and that's the problem. To ride in traffic you should be sitting upright with a straight back so you can see the traffic by turning the head a little from side to side, not having to tilt it up at almost 90 degrees and then bend it around. And the twits who ride about in traffic like that wonder why they hit people and things.
