'Runner's high' may also strengthen hearts

Endorphins and other morphine-like substances known as opioids, which are released during exercise, don't just make you feel good -- they may also protect you from heart attacks, according to University of Iowa researchers.

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<p><a href="http://www.physorg.com/news113750032.html">'Runner's high' may also strengthen hearts</a></p> <p>Endorphins and other morphine-like substances known as opioids, which are released during exercise, don't just make you feel good -- they may also protect you from heart attacks, according to University of Iowa researchers.</p>