Fox Health: Ultramarathons: Is running 100 miles bad for your health?

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Ultramarathons: Is running 100 miles bad for your health?

<p>Ultramarathons â€" races over 26.2 miles â€" have experienced an exponential surge in popularity over the past decade, as runners line up to push their bodies to the limit during races that sometimes boast 100-mile-long courses.</p><img src="http://feeds.feedburner.com/~r/foxnews/health/~4/s2-pRUckvxE" height="1" width="1"/>

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