When the weather warms to unbearable degrees, there is nothing easier than running in a cool, air-conditioned gym where water, restrooms, and CNN are at your disposal.

But what do you lose from running inside?

- Vitamin D. Yes, although it seems hard to remember the importance of Vitamin D when the summertime sun is trying to burn you bright red most of the time, it is important to still get good doses of this critical vitamin - and from its original source.


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