As one of the most well-known health and fitness experts in the world, Bob Harper brings his signature enthusiasm and expertise to “The Biggest Loser” as host. Harper, a three-time New York Times best-selling author, was a staple on the mega-hit reality series for 17 seasons during its initial run on NBC.

Despite dedicating his life to inspiring healthy lifestyles in others, Harper’s world came to a halt when in 2017, at the age of 51, he suffered a heart attack. The world wondered how such a paradigm of health and wellness could experience something so antithetical to his lifes...