7 Weird Things That Happen When You Run a Lot

You run because it makes you fit, slim and healthy, right? But when you increase your mileage beyond your usual threshold—say training for a half-marathon or more—you might find bizarre things happening, like stomach cramps, night sweats or cold hands.

What's going on? You've taken your body literally outside your comfort zone.

These high-mileage symptoms should subside when you return to your regularly scheduled programming, but if they don't, see your doctor stat. (Or maybe talk to your doctor anyway. No article is a substitute for medical attention, right?)

In the meantime, here's a look at why these weird things are happening to you.

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