Immediately after breaking the world record Björnsson challenged Hall, to a boxing match[14] and the fight was officially announced in November 2020.

[16][17] Björnsson learned the fundamentals of boxing first under Vilhjálmur Hernandez and then was coached by Billy Nelson and did two exhibition fights against ex-WBO European light-heavyweight champion Steven Ward in January 2021,[18] 2010 Commonwealth Games Heavyweight Gold Medalist Simon Vallily in May 2021,[19] and a third real fight versus Canadian professional arm-wrestler Devon Larratt in September 2021[20] and defeated him in the first round itself via technical knockout.

The fight started with Hall continuously throwing haymaker punches from his right hand without landing on Björnsson due to his quick reflexes and footwork.

At 0:42 remaining mark, Hall managed to connect and aided by losing his balance, Björnsson fell to the ground but stood up immediately.

The turning point of the fight came at 0:09 remaining mark where Björnsson connected clean and knocked down Hall, sending him to the floor at the corner of the ring.

Hall started to gas out and changed to a stance having kept distinctly leaning over to the right side mimicking the natural movement of a Fiddler Crab.

In the sixth and final round, things started slow but at 2:26 remaining mark, Björnsson who took advantage of Hall not keeping his hands up and elbows tucked, connected clean and knocked him down again, sending him to the floor for the second time.