Career
He remains Denmark"s most successful wrestler at the Olympics. Jensen first competed at the 1904 World Wrestling Championships, failing to finish in the top three of his weight category. Returning the following year, he was victorious in the heavyweight competition, taking the gold medal.
He also placed second in the European championships on three occasions.
Olympics
He competed for Denmark at the 1906 Summer Olympics, in the Greco-Roman heavyweight class and in an open weight class for all Greco-Roman competitors. In the very first round of the heavyweight class he faced the Austrian wrestler Arnold, who he considered to be his greatest threat in the competition.
After an hour of wrestling, Jensen emerged victorious. In the second round he faced Ronti, of the German team who weighed in excess of 120 kilograms (264 lbs).
Following that gold medal, he competed once more in the open competition, winning that competition as well and a second gold medal.
He competed at the following two Olympic Games, winning the bronze medal in the Greco-Roman super heavyweight event at the 1908 Summer Olympics and another bronze medal this time in the Greco-Roman heavyweight competition at the 1912 Summer Olympics. After three hours of wrestling in the open air, Jensen retired from exhaustion on a particularly hot day. Including those medals at the 1906 Games, Jensen remains Denmark"s most successful wrestler at the Olympics with his four medals.