It's not your back that hurts, it's your neck.
Back only hurts if you have weak stomach muscles and footrests are in wrong position
I have some sort of ruptured disc because of clubman's and clip-on bars, when I tilt my head back you can feel it 'popping out'
Doctor told me it's also real common with house painters (painting ceilings)
Beachcomber, I'm not as old as Hoof but my father never had a car licence, he knew a lot of people on bikes in 60's, I grew up with it