A new study claims that post-menopausal women can turn back the time clock by 16 years with just 12 weeks' of sweat on an exercise bike.
The research claimed that over-50s who make regular visits to the gym, go for a long bike ride or enjoy a swim can regain the fitness they had in their thirties.
Tests on older women revealed that a one-hour cycling session five days a week improved their blood pressure and heart rate, reports The Sun.
Professor George Brooks, of the University of California, said: "The women in our study had the cardiovascular and metabolic capabilities of women 16 years younger.
"The results are very encouraging for exercise without weight loss."