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US First Lady Michelle Obama (C) perform...US First Lady Michelle Obama (C) performs "tai chi" with students from the Chengdu No7 High School in Chengdu in China's southwest Sichuan province on March 25, 2014. Michelle Obama arrived in China on March 20 with her mother and daughters to kick off a seven-day, three-city tour where she will focus on education and cultural exchange.   AFP PHOTO / Peter PARKSPETER PARKS/AFP/Getty Images

Peter Parks/AFP

US First Lady Michelle Obama performs t’ai chi with students from the Chengdu No 7 High School in Chengdu, in China’s southwest Sichuan province. Michelle Obama arrived in China last week with her mother and daughters to start a seven-day, three-city tour where she will focus on education and cultural exchange. Read more

Cyclists start the Sport Stage of the 2nd day of Dubai Tour in Dubai, United Arab Emirates, Thursday, Feb. 6, 2014.

Kamran Jebreili/AP

Cyclists start the sport stage of the 2nd day of the Dubai Tour on Thursday

Team Cannondale leads the chase of the first pack for their sprinter Peter Sagan of Slovakia, last in line in the best sprinter's green jersey, during the seventh stage of the Tour de France cycling race over 205.5 kilometers (128.5 miles) with start in Montpellier and finish in Albi, southern France, Friday July 5, 2013. Center is Daryl Impey of South Africa, wearing the overall leader's yellow jersey.

Christophe Ena/AP

Team Cannondale leads the chase of the first pack for their sprinter Peter Sagan of Slovakia, last in line in the best sprinter’s green jersey, during the seventh stage of the Tour de France cycling race over 205.5 kilometers (128.5 miles) with start in Montpellier and finish in Albi, southern France. Centre is Daryl Impey of South Africa, wearing the overall leader’s yellow jersey.

Rugby Union - 2013 British and Irish Lions Tour - Australia Recovery Session Session - Coogee Beach, Sydney...Australia's Christian Leali'ifano (left) and Israel Folau (right) during a recovery session at Coogee Beach, Sydney in Australia. PRESS ASSOCIATION Photo. Picture date: Monday 1st July 2013. See PA story RUGBYU Lions. Photo credit should read: David Davies/PA Wire. RESTRICTIONS: Editorial use only, Non-commercial use, Photographs cannot be altered or adjusted other than in the course of normal journalistic or editorial practice (including cropping/manipulation for purpose of formatting or superimposition of captions/headings). Call 44 (0)1158 447447 for further information.

David Davies/PA

Rugby players Christian Leali’ifano (left) and Israel Folau (right) during a recovery session at Coogee Beach, Sydney in Australia.