A new study out of the Cardiovascular Research Institute in Allentown, Pennsylvania just found that jogging more than a few hours a week could be bad for you.

The researchers found that people who went running for more than two to three hours a week have similar lifespans to people who never exercise

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The healthiest people were the ones who got a moderate amount of exercise but didn't overdo it.

For whatever reason, the researchers didn't bother to figure out why running too much is bad for you.  Their best theory is that running causes too much wear and tear on the body, which causes it to break down early. (Health Day)