For those less familiar, let's take a look at who Jillian Michaels is and what she's been up to since the Biggest Loser wrapped – and what we know so far about her decision not to appear in the Netflix docuseries,

Bob Harper, who cohosted 12 seasons of The Biggest Loser with Michaels, said in a recent interview with The Guardian that she was not among the alums of the controversial reality competition series who reached out to him after he suffered a heart attack.

"Biggest Loser" trainer Bob Harper opened up about his 2017 heart attack, including the reaction of his costar Jillian Michaels.