Sitting straight 'bad for backs'

BBC News:

In this study, the patients assumed three different sitting positions: a slouching position, in which the body is hunched forward as if they were leaning over a desk or a video game console, an upright 90-degree sitting position; and a “relaxed” position where they leaned back at 135 degrees while their feet remained on the floor.

I’ve been suffering from worn discs (on the lowest two levels) on and off for more than 10 years now. Most of the time I’m doing okay, other times it’s more pronounced and I can hardly move. Looks like I should’ve used the leaned back position on the Aeron much more often.