The Biggest Loser trainer Bob Harper came perilously close to death when he suffered a heart attack in February 2017. The shocking health scare was seemingly unimaginable for Harper, who spent 18 seasons training contestants on The Biggest Loser to make their physical and emotional health a priority. Harper revealed during an April 2017 appearance on NBC's Today that the last thing he remembered was exercising with friends before passing out and waking up two days later in a hospital bed.