Madonna 'tones down the arm exercises'

Madonna has apparently vowed to tone down her fitness regime after seeing pictures of her 'sinewy' arms.

The 50-year-old star, who insisted that the photos had been digitally altered, has reportedly asked her trainer to help make her arms less muscular.

A source told Grazia magazine: "It's Madonna's birthday next week and she's showing no signs of taking it easy. There aren't many women her age who have a body like that but even Madonna may have to admit this time she might have to tone it down."

The insider continued: "She asked her trainer Tracy Anderson what she could do to stop her arms looking so sinewy. Tracy told her to do more stretching exercises to make them look leaner and Madonna has decided to follow her advice."

Friends of the '4 Minutes' singer have previously claimed that she secretly likes her muscly biceps.