That's if you want to get rid of the flabs.

New research shows the amount of time women need to spend exercising to burn off weight as they age.

At least an hour of moderate activity a day is needed for older women at a healthy weight who aren't dieting. For those who are already overweight — and that's most American women — even more exercise is called for to avoid gaining weight without eating less, the study results suggest.

However, they remind that not fulfilling an entire hour's worth of exercising is not to be distressed upon:

Brisk walking, leisurely bicycling and golfing are all examples of moderate exercise. But don't throw in the towel if you can't do those things for at least an hour a day. Even a little exercise is good for your health even if it won't make you thin, the researchers said.