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Extreme endurance exercise harmful to your heart

(Andy Bennett/CBC)
Turns out constant training for long-distance events, like marathons and bike races, may not be making us healthier.

A new study in the June issue of the Mayo Clinic Proceedings takes a look extreme endurance exercise. It finds that people who chronically train for long distance races may actually be damaging their hearts.

Daybreak's Shelley Joyce spoke to fitness buffs about how they feel about the news, and host Chris Walker speaks with Gareth Jones, an Assistant Professor of Kinesiology at UBC Okanagan.

Gareth teaches his students about the benefits and risks of exercise on the heart, but he can personally relate after learning he has heart damage he suspects is due to endurance Nordic ski training.
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