Jack Green (athlete) Jack Green (athlete) Jack Green (born 6 October 1991) is a British sprint athlete who specialises in the 400m distance, along with the hurdles and the 4 × 400 m relay. He competed for the Great Britain team at the 2012 Summer Olympics in London and at the 2016 Summer Olympics in Rio de Janeiro. Since late 2010, Jack Green has trained with Malcolm Arnold at the University of Bath alongside fellow hurdler Dai Greene. At the 2011 World Championships, he finished fifth in his semi-final, a performance he described as "embarrassing, a waste of my time and the team's
Martin Keller (athlete) Martin Keller (athlete) Martin Keller (born September 26, 1986 in Rochlitz, East Germany) is a track and field sprint athlete who competes internationally for Germany. Keller represented Germany at the 2008 Summer Olympics in Beijing. He competed at the 4x100 metres relay together with Tobias Unger, Alexander Kosenkow and Till Helmke. In their qualification heat they placed third behind Jamaica and Canada, but in front of China. Their time of 38.93 was the sixth fastest out of sixteen participating nations in the first round and they qualified for the final. There they sprinted to a time of 38.58 seconds, which