Despite working together on The Biggest Loser, Jillian Michaels and Bob Harper's offscreen friendship was quite different - but where do they stand now? NBC's The Biggest Loser, which premiered in 2004, followed a group of people deemed overweight who would compete in a 30-week competition. The goal was to lose as many pounds as possible to be crowned "the biggest loser." The competition series quickly became a cultural phenomenon as viewers tuned in weekly to see Michaels and Harper train contestants.