Spectators watch as athletes prepare to race at the 2017 Penn Relays in Philadelphia, Pennsylvania, on April 28. Throughout the three day period of the Penn Relays, top male and female athletes from around the world compete in a variety of events. The Penn Relays are the oldest and largest track and field competition in the United States, hosted annually since April 21, 1895.

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Photo credit: © PR Library / Alamy / Afripics
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