 Ramba uchiverenga ndima ino - Christiansen akatanga basa rake nokumhanya mu biathlon uye kumhanya muchando semudiki pamwero wenyika. Muhuduku hwake, chidhori chake chikuru chakanga chiri Ole Einar Bjørndalen. Christiansen akadzidza zvakawanda nezvekudzidzira kubva mumabhuku uye nezveBjørndalen, uye akafuridzirwa nemafungiro aBjørndalen ekudzidzira, uye akatanga kudzidzira zvakanyanya uye nesimba, kubva pazera diki kwazvo. Pazuva rokupedzisira reWorld Championships ra2004, Christiansen akaisa chinangwa chenguva refu chekukodzera maOlympics echando a2014. Muna 2008, Christiansen akapinda Norwegian College of Elite Sport muGeilo. 