It hurts when I do this... so maybe don't do it?
In the last couple of months I've developed a horrible lower back pain. It seems to be tied to the armchair I've been using for my laptop. After trying to adjust how I sit for days I finally caved and moved to the couch yesterday/last night and today I feel MUCH better. Said chair is not moving with me. At least I didn't buy it I acquired it in my last move and am okay giving it up. Oh well a chair lost, a back retained and the ability to straighten up again without pain is just priceless :).