The 34-year-old singer will get on her stationary bike next month to raise money for the Nevada Childhood Cancer Foundation, reported Contactmusic.
Announcing news of the inaugural Britney Spears Piece of Me Charity Ride at Xcycle in Las Vegas, where she is currently performing a residency, the "Toxic" star is offering 25 fans the chance to join her for a 45-minute indoor cycling workout.
But the saddle space doesn't come cheap - those hoping to sweat it out with Spears will have to pay USD 10,000 to USD 50,000.
Spears is also picking out the music for the cycling class.
One lucky fan, who makes a USD 10 donation to the charity, will get the chance to cycle for free and then catch Britney onstage in her Piece of Me show.
The Britney Spears Piece of Me Charity Ride will take place on October 27.