US First Lady Michelle Obama performs the Interlude dance during an event highlighting her "Let's Move" initiative attended by over 10,000 youths at the Wells Fargo Arena in Des Moines Feb 9, 2012. The first lady is on a three-day trip to mark the second anniversary of her "Let's Move" initiative.[Photo/Agencies]

US First Lady Michelle Obama (C) performs the Interlude dance during an event highlighting her "Let's Move" initiative attended by over 10,000 youths at the Wells Fargo Arena in Des Moines Feb 9, 2012.[Photo/Agencies]