The fitness entrepreneur married Bill Moore in 2003, after meeting at the gym she was working at at the time.
"We had been great friends for many, many years and continue to be so even today," she explained to Who Are You podcast host Pete Timbs.
The fitness entrepreneur explained that once Bill left the gym to work in the car industry, Michelle's goal was to build up her business and brand so that her husband could join her team and work with her. This eventually happened once she scored a role on Network Ten's The Biggest Loser and got her first book deal.
When asked by Pete whether their working relationship kicked off the breakdown of their marriage, Michelle wasn't afraid to discuss.
"I don't shy away from a conversation like this because I think I learn some really big lessons," she said. "We were working 24/7, I'd started by 12 week body transformation program with another business partner, the show was on, books had to be written, it was getting really, really, really busy."
She continued, "It was almost to my detriment because I feel like I was getting exhausted. Bill was trying to keep it all together, I was the face of it all. We both were agreeing that we were living with our business partner. We were going through the diary in bed in the morning."
Despite their breakup, the 47-year-old revealed that Bill continued to work with her for another 18-months, and they still socialise in the same circle of friends.
Michelle also opened up about her relationship with current partner Steve 'Commando' Willis. Listen to the full interview in this week's episode of WHO magazine's podcast Who Are You.