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Coördinatie en snelheid: uitleg van Gert-Jan Liefers
Men's 1500m (finish) - 2001 Monte Carlo (Golden League)
Gerrit Jan 'Gert-Jan' Liefers is a former Dutch middle distance runner, who came 8th in the 1500 m final at the 2004 Olympics. He was also a finalist in the same event in the 2001 and 2003 World Championships.