ANNA CALVO AND ANA LIZA PELLICER

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                    [ArticleID] => 571663
                    [Title] => Vertical limits
                    [Summary] => 
The running boom is spreading to more and more urban centers and creating more challenges for serious runners.
                    [DatePublished] => 2010-05-03 00:00:00
                    [ColumnID] => 135979
                    [Focus] => 0
                    [AuthorID] => 1804781
                    [AuthorName] => Bill Velasco
                    [SectionName] => Sports
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Vertical limits

By Bill Velasco | May 3, 2010 - 12:00am

The running boom is spreading to more and more urban centers and creating more challenges for serious runners.

Sports