Keeping active for half an hour a day can reduce the risk of cancer of the womb by nearly half, according to a study.
Just 38 minutes of daily physical activity, combined with maintaining a healthy weight, could help to prevent 44 per cent of new cases.
The World Cancer Research Fund's Continuous Update Project found strong evidence that about 3,700 cases could be prevented every year.
Womb cancer mostly affects women aged over 60. The most common is endometrial - affecting the womb lining.
Doctor Elisa Bandera, a CUP panel member and Associate Professor of Epidemiology at Rutgers Cancer Institute in the United States, said: "Endometrial cancer is one of the most common cancers among women, but a significant proportion of cases could be prevented every year by maintaining a healthy weight and being physically active."