Most UK adults are so unwilling to exercise that not even the threat of an early death is enough to get them off the sofa, a survey suggests.
Only 38% of people questioned by YouGov said they would do more exercise if their life depended on it.
And British Heart Foundation figures show only a third of people manage to do enough exercise to achieve the minimum recommended amount.
Experts warned inactivity is dangerous even in those who are a healthy weight.