Jillian Michaels rose to fame after being a trainer on The Biggest Loser - which was met with controversy from time to time - but where is she 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 Bob Harper train contestants.