Athletics

A Maasai woman in traditional clothing celebrates as she welcomes the national athletics team at the Jomo Kenyatta airport in Nairobi on Monday, after they topped the medals table at the recently concluded 15th International Association of Athletics Federations (IAAF) World Championships at the National Stadium in Beijing, China

Thomas Mukoya/Reuters

A Maasai woman in traditional clothing celebrates as she welcomes the national athletics team at the Jomo Kenyatta airport in Nairobi on Tuesday, after they topped the medals table at the recently concluded 15th International Association of Athletics Federations (IAAF) World Championships at the National Stadium in Beijing, China

Janek Oiglane of Estonia competes in the men's decathlon shot put event during the 15th IAAF World Championships at the National Stadium in Beijing, China August 28, 2015.

Fabrizio Bensch/Reuters

Janek Oiglane of Estonia competes in the men’s decathlon shot put event during the 15th IAAF World Championships at the National Stadium in Beijing, China

Usain Bolt of Jamaica sits on a bench with Justin Gatlin of U.S. after the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing...Usain Bolt of Jamaica (L) sits on a bench with Justin Gatlin of U.S. after the men's 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China August 27, 2015. Bolt finished in first place and Gatlin in second place

Kai Pfaffenbach/Reuters

Usain Bolt of Jamaica sits on a bench with Justin Gatlin of U.S. after the men’s 200 metres final during the 15th IAAF World Championships at the National Stadium in Beijing, China on Thursday. Bolt finished in first place and Gatlin in second place

A maintenance worker mops steps at the Beijing Olympic Stadium, also known as the Bird's Nest, in Beijing, Thursday, Aug. 20, 2015. Final preparations are being World Athletics Championships, which runs from Aug. 22 to 30.

Mark Schiefelbein/AP

A maintenance worker mops steps at the Beijing Olympic Stadium, also known as the Bird’s Nest, in Beijing, Thursday. Final preparations are being World Athletics Championships

Belgium's Nafissatou Thiam competes in the women's high jump qualification during the world indoor athletics championships at the ERGO Arena in Sopot March 7, 2014.

Kai Pfaffenbach/Reuters

Belgium’s Nafissatou Thiam competes in the women’s high jump qualification during the world indoor athletics championships at the ERGO Arena in Sopot on Friday

Bolt of Jamaica crosses the finish line ahead of Williams of Britain to win their men's 200 metres heat during the IAAF World Athletics Championships in Moscow

Fabrizio Bensch/Reuters

Usain Bolt of Jamaica (bottom) crosses the finish line ahead of Delanno Williams of Britain to win their men’s 200 metres heat during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow, Russia, on Friday

Spiegelburg of Germany reacts as she competes in the women's pole vault final during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow

Dominic Ebenbichler/Reuters

Silke Spiegelburg of Germany reacts as she competes in the women’s pole vault final during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow on Tuesday

Germany's Lisa Ryzih competes in the women's pole vault final at the World Athletics Championships in the Luzhniki stadium in Moscow.

David J. Phillip/AP

Germany’s Lisa Ryzih competes in the women’s pole vault final at the World Athletics Championships in the Luzhniki stadium in Moscow.

Competitors jump a water obstacle in the men's 3000 metres steeplechase heat during the IAAF World Athletics Championships at the Luzhniki Stadium in Moscow...Competitors jump a water obstacle in the men's 3000 metres steeplechase heat during the IAAF World Athletics Championships at the Luzhniki Stadium in Moscow August 12, 2013.

Kai Pfaffenbach/Reuters

Competitors jump a water obstacle in the men’s 3,000m steeplechase heat during the IAAF World Athletics Championships at the Luzhniki stadium in Moscow on Monday

Sprinters from the Netherlands practice their starts

Kai Pfaffenbach/Reuters

Sprinters from the Netherlands practice their starts during a training session for the IAAF World Athletics Championships at the Luzhniki stadium in Moscow

Jamaican sprinter Usain Bolt holds a programme with cut outs for his eyes during a news conference in Paris. Bolt will take part in the IAAF Diamond League athletics event at the Stade de France in Saint-Denis, near Paris, on July 6

Philippe Wojazer/Reuters

Jamaican sprinter Usain Bolt holds a programme with cut-outs for his eyes during a news conference in Paris. Mr Bolt will take part in the IAAF Diamond League athletics event at the Stade de France in Saint-Denis, near Paris, on July 6.