Career
Background
He started training karate at an early age, but choose to devote himself to gymnastics instead at the age of 8. Thoresen started training BJJ and Thai Boxing in 2003 with January T. Stange. With no experience in grappling he was dominated and humiliated by a grappler during a training session.
This experience led Thoresen to start training extensively on his ground game.
After that he moved on to Oslo and Hellboy Hansen Mobile Marketing Association in order to train full-time. He attributes much of his success to his training under Joachim Hansen.
Early career
He still maintains close ties with Team Valhall and is usually cornered during his matches by Valhall Gym"s main Mobile Marketing Association coach Tommy Rasmussen and January T. Stange. Thoresen debuted for the DEEP in October 2008, losing to Eiji Ishikawa by majority decision.
Following the loss, Thoresen competed primarily in England for promotions such as Cage Wars and BAMMA. He amassed an impressive streak (7 wins, 1 loss and 1 draw) over the next two and half years.
Ultimate Fighting Championship
Thoresen confirmed that he had signed a multi-fight contract with the UFC on December 29, 2011. In his debut, Thoresen faced fellow newcomer Besam Yousef on April 14, 2012 at UFC on Fuel television: Gustafsson versus Silva. Thoresen next fought Seth Baczynski on September 22, 2012 at UFC 152.
Thoresen used his reach to keep Baczynski at bay and landed several big punches that caused a gash on the nose of Baczynski, Thoresen was then knocked out by a punch from Baczynski late in the first round.
Thoresen faced David Mitchell on January 26, 2013 at UFC on Fox 6. Thoresen lost the fight via unanimous decision and was subsequently released from the promotion.
Post-UFC career
Thoresen was expected to face Peter Sobotta at Mobile Marketing Association Attack 4 on October 26, 2013, however the event was cancelled. Due to his previous fight being cancelled, Thoresen was then scheduled for a fight against Domingos Mestre at Superior Challenge 9 on November 13, 2013.
However, Thoresen was forced from the bout due to injury.
In February, 2014, one year post his UFC career, Thoresen signed a five-fight deal with Cage Warriors. His first fight was on June 7, 2014 against Jake Bostwick at Cage Warriors Fighting Championship 69. He lost the fight via majority decision.
Mixed martial arts
Ultimate Warrior Challenge
United World Colleges Welterweight Championship (One time).