Luton has been named as one of the country's most inactive areas as a report warns a "pandemic" of inactivity is leading to early deaths.
In the 15 local authority areas where the problem is at its worse, not-for-profit health group Ukactive said there was an average of 342 premature deaths per 100,000 people each year, compared with 242 in those places where people exercised the most.
Its study found 35.88% of people in Luton were considered inactive - the fourth highest in the country.
Cambridgeshire has some of the most active residents in the UK with 22.76% taking regular exercise.
David Stalker, chief executive officer of Ukactive, said inactivity was "a distinct risk to public health".