Career
He obtained silver medal three times in the World Championships, in 1970s, 1971 and 1974. Until January 1973 use of anabolic steroids was not prohibited. Jenssen has been open about his use of steroids until the ban, including during the 1972 Olympics.
He started using methandrostenolone prescribed by his general practitioner in 1970.
He stated that he has no bad conscience about the use, as he estimates that 49 of 50 of the world"s best weightlifters used steroids at the time.