Michaels spoke with the Mail Online and revealed that she wanted some changes made to the format of the weight-loss show.
"I asked for changes and they said no, so in my opinion I believe it was their choice. I was willing to stay if certain changes were made and they said no," she said.
While she didn't specify what those changes were, many fans believe it was her objection to the amount of weight last season's winner, Rachel Frederickson, lost.
Michaels explained, "I thought she lost too much weight without a doubt. She came in at 105 pounds and I would like to have seen her come in at 135 pounds so weighing around two stone [approximately 28 pounds] more than she was."
So, Michaels approached producers with a few ideas about the NBC show.
She said, "I went to them and said I'd like to see these changes and they said no so I did not quit they basically said no we're not interested in changing x, y and z, so we will part ways. In all fairness it was their show, so I said if we can't do this, this and this, I'd like to be released and they said you're released."
The trainer realized she had a responsibility as a promoter of nutrition and health. She wanted to make sure she was projecting the right image.
"You go to this place where you are like I didn't know, I'm not a producer, I wasn't her trainer and then I had to stop and think regardless, I was benefiting from being on that platform as a professional and I'd been the face of the show.
"But then you've got to take responsibility for it good and bad and I felt actually pretty ashamed. I got to a place where I thought if I'm going to be the face of something, I've come to a point in my career where I have to have control and that's where I'm out," she shared.
Michaels is next touring nine cities in the U.K. for her Maximize Your Life tour beginning in January 2015.
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