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The New York Times

The heartache of being sidelined from your favorite sport

One challenge: the absence of uplifting hormones. “There are a lot of endorphins and chemical changes that happen in our body when we exercise,” says Jared Vagy, USC assistant professor of physical therapy. “If that’s the only method that some people have to release those chemicals, then you’ve just lost a large part of what makes you complete as a human or satisfied.” (The New York Times; may require subscription)