Jenkins' first coach was Jake Young, then head of physical education at the Edinburgh Academy. In his youth, Jenkins was the European record holder at 400-metres for under 17 and under 19 years old. In 1969 he represented Great Britain's senior open team in Hamburg, West Germany, winning the 400-metres aged 17 years four months. He went on to compete for Great Britain in the
1972 Summer Olympics held in
Munich, Germany in the 4 × 400-metre relay where he won the silver medal with his teammates
Martin Reynolds,
Alan Pascoe and
David Hemery. From 1973 to 1977 Hemery, a contemporary and 1968 Olympic hurdles champion, coached Jenkins. In 1974 he won the silver medal on the 400 metres at the
European Athletics Championships in Rome as well as the gold medal in the 4 × 400-metre with his teammates
Glen Cohen,
William Hartley and
Alan Pascoe. Commentating on the race for the
BBC David Coleman remarked that Jenkins had the "greatest run of his life", when he won the 4 × 400 m relay. In 1975 he was United States of America 400-metre champion, with his fastest time of his career 44.93 which was a
British record at the time. In 1975, Jenkins and his brother,
Roger Jenkins, represented Great Britain and Northern Ireland v. Finland at
Crystal Palace, London as the UK's No. 1 and No. 2 400-metre runners. Both David and his brother Roger feature prominently in the book A Life In A Day In A Year by
Peter Hoffmann which describes their athletics training at
Meadowbank Stadium, Edinburgh and their racing careers between 1973 and 1978. Scottish documentary company, Pelicula Films, featured David Jenkins during his training in 1975 as he prepared for the
1976 Summer Olympics. The film,
The Long Sprint: Diary of an Olympic Athlete, follows Jenkins from his training, races and the Olympic Games heats. Jenkins qualified for the Olympic 400-metre finals but did not win a medal. The documentary film was directed by Michael Alexander and won the Gold Grand Prix Award in the British International Sport Film and Television Festival, the Toronto Film Festival and the Turin Film Festival in 1977. In 1976 and 1980 Jenkins finished seventh in the 400-metre final at the Summer Olympics. In 1977 he participated in the first
IAAF World Cup in the 4 × 400-metre relay at the
Rheinstadion, in Düsseldorf, West Germany. He also won the 200 metres at the Jubilee Games event. In 1978 he won a gold medal competing for Scotland at the
Commonwealth Games in Edmonton, Canada in the 4 × 100 m relay, alongside
Cameron Sharp,
Allan Wells and
Drew McMaster. In 1980 he was U.K 400-metre champion. He competed at the
1982 European Championships in the 4 × 400–metre relay team which won the silver medal in this event. He later admitted to having taken performance-enhancing
steroids during the latter part his athletics career, from around 1976. In 1998 former British 400-metre Olympic silver medallist
Roger Black dedicated a chapter titled "The Jenkins Factor", in his autobiography
How Long is the Course to Jenkins who was helping advise him in the final months of his 1996 Olympic preparation. Jenkins was credited with changing Black's philosophy on sports and competition.
Personal bests •
British record holder over 400 metres from 1971 to 1985. • Held British and United Kingdom records for best performances 100 metres at 10.1 seconds [10.33], 200 metres at 20.3 seconds [20.66], 300 metres at 32.44 seconds, 400 metres at 44.93 seconds and 500 metres at 1:00.9 seconds. • 1971 – Jenkins broke iconic Scottish Olympic sprint champion,
Eric Liddell's, University of Edinburgh's 400-metre record of 47.6 seconds (world and Olympic record Paris, France 1924). A record Liddell held from 1924 until 1 May 1971 when Jenkins ran 46.4 seconds at Meadowbank. Jenkins' University record of 45.3 seconds (Europa Cup Semi-final Oslo, Norway, 1973) remains today. ==Drug smuggling conviction==