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San Francisco 49ers quarterback Colin Kaepernick (R), Michelle Obama (C) and tennis player Serena Williams (L) dance on stage

These celebrities dance on stage with school children during an event to bring physical activity back to schools, hosted by the American Alliance for Health, Physical Education, Recreation and Dance (AAHPERD) and the Alliance for a Healthier Generation in Chicago, Illinois, February 28, 2013.Jeff Haynes, Reuters
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