A group of cardiologists is warning that extreme endurance exercise, such as running marathons, can be bad for your heart.
Marathons can be dangerous, doctors say
CBC News Posted: Jun 09, 2012 10:33 PM ET Last Updated: Jun 09, 2012 10:31 PM ET
Top News Headlines
Latest Canada News Headlines
- Suspect hospitalized, rural property owner in custody after shots fired south of Calgary
- Airplane fart fight proves it's tough to raise a stink in a smelly world
- Anne Norris found not criminally responsible for killing Marcel Reardon
- 'Shock' and 'heartbreak' after adopted pig ends up on dinner table
- Police investigate after 4 found dead near Burk's Falls, Ont.