An early model 206A had the most uncomfortable seats ever!
205-212 ugh.
Company refusal to refurbish seats.
Early Astars..with the short seat backs.with no shoulder harness..yeah that would protect you during a crash..NOT!
76s..not much better.
S-92 and EC225...don't even get me started.
Now on LTD due neck/back problems ..but hardly unexpected after 17000 plus.
Other factors...helmet (had to give up the helmet around 12000 hrs) ...life jacket with 5kg of stuff in it...being tall and having the shoulder harness pulling down on your shoulders, the survival suit fit around your neck. I could go on and on.
Basically the manufactures and companies never seemed to get the point that some folks would be sitting in these seats for years.