16 competitors from the 2012 Olympics are absent.
The Olympic champion is spotted taking videos during a match in Centre Court at Wimbledon.
A list of the top 100 track & field athletes using the social media service Twitter.
He wants his athletes to have fresh legs going into their races.
He dusted the field of 20 runners in the men's 5000m.
He has been a force in the race since its founding five years ago.
The inaugural event kicks off on May 26.
The Somali-born runner has dominated the 5000m event in the series.
He would also like to set a British record.
The double-Olympic gold medalist learned a lot about his race.