Sitting in your office chair all day causes as many deaths as smoking, and is deadlier than obesity, a new report claims.
A study by Cambridge University says that to undo the harm of an eight-hour day spent sitting down, you need to do an hour of exercise.
A brisk walk or bike ride could reduce the risk of early death by 60%, the study says.
Steve Ward, a director of UK Active, which aims to get more people exercising, believes office culture must be changed to combat the issue.
"We're going into our places of work, which have environments set up to get us sitting down and doing nothing," he told Julia Hartley-Brewer.
"If you create a culture of an active office you create the culture of a happy engaged office.
"Employers could do something as simple as putting 'walking meeting' as the first option on meeting-room booking lists."
Doctor Iqbal Malik, a consultant cardiologist at Imperial College Healthcare, explained some simple ways to improve activity levels.
"If you got off one stop earlier and walked, and did the same thing on the way home, you will have done what you have to do," he said.
"If you decided not to use the remote control and use the button on the TV you're gaining benefit. If you decide to go to the fridge instead of getting someone else to go, you're benefitting.
"There's definite evidence that it helps you live longer."
Listen to the full interview above