[Margaret Pilkington]

I know he was young, but he was hardly a child. Surely he must've had to get up for a call of nature and something to eat.
Anytime you are sat in one place for a long time, puts you at risk......if you have a job which means you are sat at a desk for long periods, then you should be flexing your feet and ankles, but better still, you should get up and walk around.
People who work in call centres are at particular risk...they are tied to a head set/desk and have to ask for a comfort break.