Aerobic exercise produces solid health benefits for your heart. But choose your sport carefully: One aerobic exercise in particular may lead to cancer.
Research in Great Britain suggests that men aged 50 and older who spend a great deal of time on a bicycle run a significantly increased risk of prostate and testicular cancer.
The study looked at the bicycling habits of more than 5,000 men over the course of a year. An analysis of their biking habits demonstrated that increased weekly bicycling was linked to cancer. Men who biked for more than 8.5 hours a week ran the biggest risk.
The researchers conclude: “The findings of this study demonstrated a direct relationship between risk of prostate cancer and cycling volume in cyclists aged over 50 years.”