Evening wise ones...
I work in lots of different offices/buildings on a range of different seating, from office chairs, to office sofas, tub chairs, school type chairs. I'm generally sat down for 5 hours at a time. I have started getting the most horrendous lower back pain after sitting for long periods of time. Randomly the best chair for preventing back pain seems to be my swivel office chair.
Is there anything portable I can take from place to place to save my back pain?!