A female Vietnamese artisticgymnast, who finished out of the medals, has also tested positive for a banned substance, an IOC spokeswoman confirmed.
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On Saturday, Brazilian artisticgymnast Diego Hypolito said words of advice from Rezende helped him land his final tumble after errors in London and Beijing.
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And the artisticgymnast Misha Koudinov is well down the field in the men's competition and won't get past qualifcation for the all around event.
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Female artisticgymnasts compete on four apparatus: beam, vault, uneven bars and floors where strength, balance and agility are needed.
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Artisticgymnast Hannah Whelan and her coach Amanda Reddin assess Hannah's chances heading into the Games, and her experience of Beijing four years ago