Back problems
Bjoern: - Sports- Try not to code on a Laptop or use a clever setup to avoid problems. E.g. see here for some details http://www.nhs.uk/Livewell/workplacehealth/Pages/Laptophealt...- The chair you sit in. It makes sense to buy a good chair if you spend all day in it.- Sitting angle. Interestingly a angle of 90 deg has shown to have more "sitting pressure" than 110-135 degrees. 
http://news.bbc.co.uk/2/hi/health/6187080.stm more details here http://www.springerlink.com/content/w3k042u614x16900/