Kjell Isaksson

Kjell Gunnar Isaksson is a retired pole vaulter from Sweden, who broke the world record several times in 1972. First he broke the record set by Christos Papanikolaou of Greece and San Jose State University two years earlier, by jumping 5.51 metres in Austin, Texas, becoming the second man to clearfeet. A week later he improved it to 5.54 m in Los Angeles, California. His technique inspired several aspects of the PetrovBubka model. Two months later he added another centimeter at a meet in Helsingborg, Sweden. His record reign was ended onJuly 1972 when the reigning Olympic champion Bob Seagren jumped 5.63 m at the U.S. Olympic Trials. Isaksson set his personal best at 5.59 m in El Paso, Texas, onMay 1972.

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Source: Wikipedia