Requiem for a heavyweight movie violin fighter?

No doubt, playing the violin made Jem Mace a Great Champion. He built up his arm strength, reflexes, timing, pen point accuracy of his right hand, and left, and learned, keeping his chin down in his left shoulder. All kids should take up violin lessons, if they want to become great fighters. Start learning when you're ten to fourteen. Begin in Golden gloves.

Joe Louis comes to mind... Also, not a HW but James "Jem" Mace was a violin player: https://british-boxers.com/blogs/news/meet-jem-mace-the-fighting-spirit-behind-british-boxers] "World champion boxer, circus owner, bar proprietor, musician and ladies' man, Jem Mace experienced enough to fill two or three lives during his 79 years – not least, practically inventing the professional sport of boxing. His career started as a bareknuckle fighter in an exhibition booth and ended with the tireless promotion of glove boxing, during which time he had helped draw up the Queensberry Rules, the basis of the sport as we know it today. It was a life that took him into the history books. This sporting legend was born in Beeston, in Norfolk, on 8 April 1831, the fifth of eight children. He couldn't read or write but he could play the violin. At 18 he was busking in Great Yarmouth when three drunk fisherman smashed his fiddle and picked a fight. To their horror, Jem discovered he was also a talented brawler, and having despatched the three assailants, he became an exhibition fighter at a travelling fair. From there, Mace became a champion, fighting all the big names in the boxing world. He fought as a middleweight, but he was fly on his feet and meticulous in the placing of his punches. It was enough to bring him victory against men much heavier."

Larry from the 3 Stooges.