Sitting in front of the computer for too long?

The Chiropractors’ Association of Australia has developed the Sit Right Widget as a simple tool to prompt computer users to take more regular breaks. The default setting is to prompt for a break every hour, although users can change these settings for 20 minute or 40 minute intervals should this assist with meeting advice from your healthcare professional.
It is free to download, and is available for Windows (Windows XP, Windows Vista and Windows 7) and Mac OS X (Lion/10.7.x only).

download here