I have had my 2008 EX civic for 3 months and I have backache! I have never had problems with any of my previous cars (Fiat 500, Peugeot 406 coupe, '95 VW Polo) and do not suffer from back problems, but these seats have no lumbar support & the damn head restraints jut forward.
This is my solution £50 Obusforme "Lowback Backrest Support" - had it for 1 day and my back is easing off.
Search the forum for "Obusforme", my picture is on page 2 of the thread-I can't post pic from my iPad