As The Biggest Loser trainers Jillian Michaels and Bob Harper each publicly weigh in on their complicated relationship, we're doing a check-in with all 18 winners from the competition series.

Harper is practically synonymous with The Biggest Loser. He trained contestants for the first 16 seasons and hosted the final two of the show’s 18-season run. Between seasons 17 and 18, Harper suffered a heart attack that left him unconscious for two days in February 2017.