Born in
Billericay, Denmark began his international career by winning a bronze medal in the 3000 metres at the 1991 World Indoor Championships. A year later, he achieved his lifetime best in the 5000m with 13:10.24 at the Rome Grand Prix on 9 June, a time that still ranks him sixth on the UK all-time list (as of 2017). Two months later at the
1992 Barcelona Olympics, he finished seventh in the 5000 metres final. He also finished ninth in the 5000m finals at the 1991 and 1993 World Championships. In 1994, he won a silver medal in the 5000m at the European Championships behind Olympic champion
Dieter Baumann, before going on to win the 5000m title at the Commonwealth Games a month later. Denmark went on to compete at three more World Championships (1995–99), and in the 10,000m at the
2000 Sydney Olympics, without reaching the finals. He concluded his international career by competing at the 2002 Commonwealth Games. He was twice the
British 5000 metres champion after winning the British
AAA Championships title at the
1995 AAA Championships and the
1999 AAA Championships. He was also three times
British 10,000 metres champion winning the AAAs in 1994, 1996 and 2002. Denmark attended
Furtherwick Park School, on
Canvey Island, and represented Basildon Athletic Club. He is still involved with athletics as a coach, coaching
Guy Learmonth in 2016. ==International competitions==