Madonna's former trainer stopped working with the singer because she was too unpredictable.
The 'Music' hitmaker parted ways with Tracy Anderson in 2009 and the fitness guru has revealed she never knew what to expect when she turned up for her sessions with the 59-year-old star.
Tracy told the Sunday Times magazine: "Some people are just not what you think. We're very different. I'm a real softie...
"If I text Gwyneth [Paltrow], or Jennifer Lopez wants to book a session, or I text Lena [Dunham', 'Lena, hey, how are you?' then I get a text right back. 'Tracy, my sweetheart, how are youuuuu?' It's, like, consistent.
"I need consistent people in my life. Consistency is like my favourite word.
"So walking in and not knowing what I might get is tough for me."
Tracy previously revealed the final straw in her working relationship with the 'Like a Virgin' singer was when she missed a musical performance from her son because of a training session with Madonna.
She said: "Madonna can demand whatever she wants to demand, she's Madonna, that's just what it is. It wasn't working for me because my demands are, like, I have a kid. When I missed my son's saxophone concert because of a training session with her, I was like, 'I can't do this anymore.' That was it for me."
Despite their acrimonious relationship now, Madonna - who has 21-year-old daughter Lourdes, and 17-year-old son Rocco from previous relationships and adopted kids David, 12, Mercy, 11, and five-year-old twins Stelle and Estere - previously praised Tracy as her "saviour".
Speaking in 2009, she said: "Tracy Anderson is my saviour. After two Caesareans, three hernia operations and one riding accident that left me with 10 broken bones, she was the only one who could pull my body back together into one piece."