The treadmill you can use at work

Many experts believe that there is convincing evidence that sitting down all day is killing us.

A number of scientific studies have identified people's increasingly sedentary lifestyles as a key reason why people succumb to crippling diseases.

Now a number of companies are trying to negate some of the bad effects, by manufacturing desks which have a modified treadmill base attached to a counter level work surface.

The belt is designed to go at a low speed - up to 4mph - which is meant to enable users to carry on their work while walking.

Peter Bowes went to meet Peter Schenk, president of the exercise equipment company LifeSpan, to see one of the machines in action.

This piece is part of the What If? season imagining what the future might hold.