After a second full year of training, Park broke what had been an American monopoly on bodybuilding titles by winning the 1951 National Amateur Bodybuilders Association (NABBA) Amateur Mr. Universe. He cemented his status by winning the 1958 and 1965 NABBA Pro Mr. Universe titles. Standing 6'1" and with a top weight of 250 pounds, Park was known for his muscular mass and was a forerunner to modern bodybuilding. Park was also renowned for his strength, which he often demonstrated in contests and strongman exhibitions. He is on record as the second man to bench press 500 lbs, after Doug Hepburn. As an actor, Park made five films—all Italian Hercules sword and sandal pictures.