"The physical and mental benefits of running." Manage drug addicts. Run Addicts, March 12, 2010. Web. December 11, 2013. . MedicineNet.com. Np, nd Web. 8 December 2013. "Steve Prefontaine." Biography.com. A+E and Web Networks. December 11, 2013. "The Top 5 Health Benefits of Running." Health-Stories.org. Np, 2008. Web. December 6, 2013. “Usain Bolt.” Biography.com. A+E Television Networks, LLC, 2013. Web. December 11, 2013. "Usian Bolt Foundation." Usiano Bolt. Np, 2012. Web. 12 December 2013. .Wilford, Giovanni Nobile. “Running the extra mile distinguishes the human being.” New York Times [New York] November 18, 2004, A24: n. page SIRS knowledge source. Network. December 11. 2013.