Jimmy started Muay Thai at 13 years old in the Star Boxing gym of Montpellier, the city where he grew up since the age of 10. He chose Muay Thai after quitting Judo which lacked intensity to his taste. In 2012 and 2013 Jimmy became European champion in amateur competitions and established himself as one of the most promising French fighter. He should have competed in the IFMA 2014 World Championship but his trip wasn't funded because his gym didn't match the federation requirements. Vienot made his professional debut during the summer of2013 in Thailand and then in France in September where he showed he was already a force to be reckoned at 18 years old by winning a one night tournament. A month later Jimmy engaged himself in the Fight tournament and was eliminated in the semi-final by Ruslan Kushnirenko in a controversial decision. Three weeks later Vienot fought for his first world title against Singmanee Kaewsamrit, he lost by decision. After racking up wins on the French scene against top fighters like Rafi Bohic and Gaetan Dambo, Jimmy entered the July 2017 Toyota Marathon tournament where he faced thai legend Petchboonchu FA Group in the semi-final. He lost the fight but was very happy with the experience he gained. Jimmy was eliminated in the first ound of the 2014 IFMA European Championship by Itay Gershon. He was asked to be in a super fight for the closing ceremony of the event, he lost a decision to hometown fighter Oskar Stazska. On November 15 Jimmy suffered the first and only knockout loss of his career when he faced thai champion Pakorn PKSaenchaimuaythaigym in the Topking World Series event. Pakorn landed a left hook that made Jimmy faceplant in the first round. After losing to Bobo Sacko in a fight at the top of the French scene, Jimmy had a 17-3 record during 2015 and 2016. Only losing to Thai champions Chanajon and twice to top fighter Yodwicha Por Boonsit. His last fight of 2016 saw him win his first world title when he knocked out Brazilian champion Jose Neto in the second round with an elbow. Two months later Vienot won his second world title, the WBC belt against Denpanom Kirakorat at the legendary Rajadamnern Stadium. During 2017-2018 Vienot continued his ascension in Muay Thai winning the All Star Muay Thai one night tournament and winning a third world title against thai champion Sorgraw Petchyindee in late 2018. He also went back to amateur competition and won the IFMA European title. Vienot diversified himself during that time taking fights in kickboxing rules against top fighters like Mohamed Hendouf, Wilson Varela and signing with Glory kickboxing to face champion and title challenger Cedric Doumbe and Alim Nabiev. In April 2019 Vienot became the fourth non thai fighter to win the Lumpinee Stadium title, beating Talaytong Sor.Thanaphet by decision. Following that win Vienot had his biggest kickboxing rules success yet a month later by beating Vedat Hoduk for the newly created Arena Fight title. In August 2019 Vienot won the IFMA World championship and received the award for "Best athlete" of the competition.
