Office workers need to get off their backsides and move around more, according to a new campaign.
On Your Feet Britain says sitting for long periods at work is linked to a host of health problems, which are not undone by working out in the gym.
It is calling on people to stand regularly, walk around more and embrace ideas such as standing meetings or standing desks.
Experts described inactivity as "one of the biggest" challenges in health.
Heart disease, type 2 diabetes, cancers and poor mental health have all been linked to sedentary behaviour.