After Jamaican sprinter Usain Bolt defended his men's 100m title in an Olympic record time of 9.63 seconds
last night (August 5), we take a look at other unbeatable athletes breaking Olympic records - including US swimmer Michael Phelps
and Team GB rowers Helen Glover and Heather Stanning.
US swimmer Michael Phelps holds up a silver trophy after being honoured as the most decorated Olympian, with 20 medals, at the Aquatics Centre in the Olympic Park during the 2012 Summer Olympics in London.
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