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  • GYM CLASS photo | Michelle Obama

Credit: Jeff Haynes/Reuters/Landov

Updated: Friday Mar 01, 2013 | 06:00 AM EST

GYM CLASS

Consider them movers and shakers! First Lady Michelle Obama, tennis ace Serena Williams and San Francisco 49ers quarterback Colin Kaepernick get pumped during an event Thursday in Chicago to promote physical activity in schools across the nation.

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