I stand half the time (my desk is adjustable). When sitting I lean far back and slide in to avoid putting too much pressure on my lower back. Sitting up straigh

I stand half the time (my desk is adjustable). When sitting I lean far back and slide in to avoid putting too much pressure on my lower back. Sitting up straight for long periods is unhealthy. The ideal angle is between 120 and 135 degrees. http://news.bbc.co.uk/2/hi/6187080.stm http://news.bbc.co.uk/2/hi/6187080.stm