Kazmaier competed in six
World's Strongest Man contests. In
1979 World's Strongest Man, he came in third after leading throughout much of the competition and beating powerlifting icon
Don Reinhoudt in the car lift by deadlifting a car. In the following years, he dominated the competitions in
1980,
1981, and
1982, winning all by significant margins. He was the first man to win the WSM title three times and to this day, remains one of only two men ever to win it three times in a row. His absence cleared the way for Kazmaier's main rival,
Geoff Capes, to win the title in 1983. Capes and upcoming
Jón Páll Sigmarsson dominated the competition during the next several years. He returned to the World's Strongest Man Contest in
1988, where he won three of eight events: the log press, deadlift and sack race; and took two second places including the truck pull, but was disqualified for moving his hands in the sausage forward hold, so the time was stopped prematurely. With two events to go, he was leading the field by 1 point over Jón Páll, and was the favorite to win the following
Weight over bar event, in which a weight has to be thrown over a bar. He was the reigning world record holder of this event from 1987
Pure Strength with a height of . The event took place on water with boats floating around and Kazmaier's concern about his orientation on water was borne out. Although he threw the weight way higher than the bar, he failed to get the trajectory right, failing at . Jón Páll won the event with a clearance of and with four contestants coming in-between the two, Kazmaier was trailing Jón Páll by four points, a deficit which cost him too much to catch up at the final event
McGlashen Stones, eventually emerging runner-up to Jón Páll. ==Professional wrestling career==