Britney Spears has parted ways with her physical trainer.

The 30-year-old singer is currently performing her final Femme Fatale tour dates in Latin America.

The strenuous stage performances coupled with the rigorous workouts from her former trainer Derek DeGrazio proved to be too much stress for the songstress.

'It was [an] amicable [split],' an insider told In Touch magazine.

Britney is thought to have been unhappy with the restrictions Derek placed on her diet.

'Britney doesn't want to worry about every single thing that goes into her mouth anymore,' the insider explained.

There is no hostility between Britney and Derek, whom she originally hired in May of this year. The fitness trainer does believe the singer was not forthcoming about what she was eating.

'[Britney] knows Jason loves her no matter what and he has encouraged her not to stress about it,' the source explained.

'But Derek felt Britney made him look bad when she cheated on her diet.'

Britney has spoken previously about why she finds fitness such a difficult activity.

'[My biggest daily challenge] is trying to get up and go work out in the morning. I haven't worked out in, like, two weeks,' she told Stylist magazine this month.

'Sometimes it's hard to be motivated. But once you get up and do it you feel like you've conquered the world.'

Britney's Femme Fatale tour ends in San Juan, Puerto Rico on December 10.