The 1500 m and mile run events have historically been some of the most prestigious track and field events. Swedish rivals Gunder Hägg and Arne Andersson broke each other's 1500 m and mile world records on a number of occasions in the 1940s. The prominence of the distances were maintained by Roger Bannister, who (in 1954) was the first to run the long-elusive four-minute mile, and Jim Ryun's exploits served to popularise interval training. Races between British rivals Sebastian Coe, Steve Ovett and Steve Cram characterised middle-distance running in the 1980s. From the 1990s onwards, North Africans such as Noureddine Morceli of Algeria and Hicham El Guerrouj of Morocco came to dominate the 1500 and mile events.