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Mike O'Hearn, also known as "Titan" is an American bodybuilder, actor, personal trainer and model. He has been featured on over 500 magazine covers, was Fitness Model of the Year seven times, and is a four-time Mr. "Natural" Universe title holder. He appeared as the gladiator "Titan" on the 2008 revival of American Gladiators. O'Hearn is the only individual to be a Gladiator on both the original (1989–96) (as Thor) and the 2008 series. He is the founder of Power Bodybuilding, a training program that focuses on developing both strength and hypertrophy, along with aesthetics.