Britain's couch potato lifestyle contributes to as many deaths as smoking, with one in six traced back to laziness or inactivity.
According to a new report from Public Health England (PHE), inactivity costs Britain £7.4bn each year, with around on in two women and a third of all men damaging their health through lack of exercise.
PHE claim that as a nation we are 20 per cent less active now than in 1961, and warned statistics are likely to increase.
'If current trends continue, we will be 35 per cent less active by 2030,' PHE said. 'Everybody needs to become more active, every day. We have to turn the tide.'
The report adds physical activity does not necessarily equate to a mammoth session at the gym, but can take the form of a brisk walk.