A study in America showed that a daily half-hour session of walking, cycling or swimming can slash the risk of a tumour returning by up to 50%. It also boosts women's chances of survival by almost 70%.

Lead study author Dr Rikki Cannioto, an epidemiologist at Roswell Park Comprehensive Cancer Center in Buffalo, New York,  said: "Our research shows some physical activity is far better, in terms of cancer survival, than no activity at all and it is just as beneficial as longer workouts."

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