Get a soft pillow, and make sure your spine is against it on you chair. No joke, if your a serious IM, you'll find sitting on a chair for extended hours continuously will do your back in, obviously costing you a fortune if your not working. DO IT NOW!! My back was aching for 2 days solid, and with 1 pillow, is right as rain after 1 hour. Don't wait till it happens to you, get your pillow now! thats an order!!