of the greatest strongmen of all time, and due to numerous world records and feats involving brute strength and static lifts, many analysts and strongman experts regard Hafþór as "the strongest man to have ever walked the earth". Boxing career On 2 May 2020, after breaking the Deadlift World Record, Hafþór challenged its previous record holder, Eddie Hall, to a boxing match. Despite having no boxing experience whatsoever, Hafþór learned the fundamentals of the sport and made commendable progress under the guidance of his coaches, Billy Nelson and Vilhjálmur Hernandez, and support from his two main sparring partners, Skúli Ármansson and Bill Hodgson. With a stricter diet that differed from his strongman days, Hafþór also transformed himself to suit the new sport, losing in the process. He started training twice a day (up to five hours per day), with a weekly routine that was segmented into fourteen sessions. They consisted of six boxing training sessions, four strength training sessions (two each for upper and lower body), and four endurance training sessions. Hafþór's first exhibition match was against ex-WBO European light-heavyweight champion Steven Ward, in January 2021. For his second exhibition match, he faced the 2010 Commonwealth Games Heavyweight Gold Medalist, Simon Vallily, in May 2021. The two fights provided him his first real ring experience. On 18 September 2021, Hafþór faced Canadian professional arm-wrestler Devon Larratt in his first non-exhibition boxing match. Larratt volunteered for the fight when Eddie Hall withdrew, after sustaining a biceps tear during training. Within the first round, the referee was forced to stop the fight, awarding Hafþór the win via TKO (technical knockout). The Mountain vs. The Beast On 19 March 2022, after almost two years since its announcement, Hafþór and Hall finally faced each other in Dubai in a fight taglined The Heaviest Boxing Match in History. Hall started the first round with continuous haymakers, but Hafþór kept his composure and stuck to the basics, focusing on a solid jab and better footwork. Once he realized Hall's game plan, Hafþór took control of the fight by bludgeoning and knocking Hall down twice, in rounds three and six. Hall sustained bleeding lacerations on top of both eyes, and Hafþór won the fight via unanimous decision. Boxing record Acting career Hafþór was cast as Ser Gregor "The Mountain" Clegane for the fourth season of the HBO series Game of Thrones in August 2013. This was his