CONTESTANTS try to get the upper hand at the first Slap Fighting Championships. Fighters went toe to toe at the Arnold Sports Festival in Ohio, US. Contestants try to get the upper hand at the first Slap Fighting Championships Fighters went toe to toe at the Arnold Sports Festival in Ohio, US Julia Kruzer slapped Adrianna “Flychanelle” Sledz as she went on to lose the round. Koa “Da Crazy Hawaiiwan” Viernes landed a hot hand on Dawid “Zales” Zalewski in the super heavyweight bout. The event was hosted by Terminator star Arnold Schwarzenegger, 74, and YouTuber boxer Logan Paul, 26. Paul was earlier left stunned following a huge knockout. Most read in The Sun STAGE FRIGHT Rocketman star Taron Egerton collapses on stage during show's opening night KATE'S FEARS Kate Garraway suffers fresh blow with husband Derek Draper MAKE SCENT Cleaning fan uses fabric softener in reed diffusers to make homes smell heavenly MECK IT WORK Lucy Meck shows off baby bump as Ryan's Corrie ex is accused of smashing car READY TO ACT SAS and US Navy SEALs 'training for high-risk rescue of Ukrainian president' SOAP 'BUST-UP' Corrie's Tina O'Brien 'smashed ex Ryan Thomas's car with bat in 1am row' Paul was in utter disbelief at what he had seen, but his fellow co-host Schwarzenegger remained unfazed by the shocking KO. The rules of the Slap Fighting Championship are that there are three rounds — one slap per round for each competitor. A winner can be determined by KO or if a participant does not proceed within 30 seconds of being slapped. The event was hosted by Terminator star Arnold Schwarzenegger, 74, and YouTuber boxer Logan Paul, 26