It appears that money woes are taking precedent over New Year fitness resolutions for thousands.
A survey has found we are being put off exercising regularly by the high cost of gyms and leisure centres.
A third of people of all ages think they are too expensive, rising to 42pc for 18 to 24-year-olds.
This compares to 19pc of those aged over 55 who do not exercise because of the cost.
The survey of more than 2,000 people, carried out for the World Cancer Research Fund (WCRF), also shows that 18pc blame the bad weather for their lack of activity.
Time pressures caused by work and family commitments are another main reason why people do not exercise, with 36pc mentioning it.
Students said they did not have enough time, with two-fifths blaming busy lifestyles for not getting active.
The laziest group, however, appeared to be the 18 to 24-year-olds, with a third saying they just could not be bothered to exercise.
Experts at the WCRF are worried the public are ignoring the health benefits of exercise, including the evidence that it reduces the risk of cancer.
Deputy head of science Rachel Thompson said: "It is a concern that so many people feel that financial cost is stopping them being more physically active."
She suggests other ways of exercising should be considered other than gyms.
"People can take up brisk walking or running, or start playing a sport that they enjoy. Even hobbies such as dancing or gardening can count."
WCRF advice is to exercise for at least half an hour daily.