Madonna is insecure about her thighs.

The 'Girl Gone Wild' singer doesn't like her upper legs and spent months working on getting them toned so she felt confident showing them off during performances on her 'MDNA Tour'.

The pop superstar's personal trainer Nicole Winhoffer said: "'We're all born with an area we're insecure about and she thinks it's her thighs so we spend a lot of time molding and sculpting. She works very hard on it."

Nicole, 28, has worked with Madonna, 54, for three years, and says she trains for between one and two hours every day solo as well as with her dancers and backing singers who are on tour with her.Speaking about the workout routine she follows with the star, Nicole added to the current issue of new! magazine: "I look to tighten the back of the arms, to cinch the waist, to flatten the lower abdominal s  to work on the inner and outer definition of the thighs and to raise the butt."[It's all about] burning calories and achieving muscle tone."Nicole also admits she is impressed by Madonna's dedication and work ethic, training so hard while also working and being a full time mother to Lourdes, 16, Rocco, 12, David, seven and Mercy, six.She said: "She's in the gym five or six days a week as well as being a full-time mother. So if I feel a bit low I just look to her and think, 'If she can do it, I have no excuse.' "