According to zoo officials, safety and security are big concerns.
The American College of Sports Medicine compiled its annual American Fitness Index and determined through a variety of criteria that
Over 30% of runners will be debuting.
There were nearly 22,000 finishers taking part in near-perfect fall conditions.
Runners now have the option to transfer their bib to someone else.
He won back-to-back weekend races and broke one course record.