The secret behind Britney Spears' fit body has been revealed - pole dancing.
The 27-year-old star has installed an eight-foot metal pole in her 1,100 pound-a-night penthouse suite at London's posh Dorchester hotel, when her Circus world tour begins its UK leg.
"Britney has a huge fan base in the UK and really wants her shows here to be a hit," the Mirror quoted a source as saying.
"Pole-dancing is an excellent cardio and fat-burning workout, and Britney has had private classes in her studio gym in LA.
"She wants to keep up her exercise regime on tour. Luckily, the hotel was happy to accommodate her needs.
"She can swing around her pole while watching TV or listening to music. Climbing up it requires real core strength. It really is hard work.
"In addition, she'll have a treadmill and stepper brought to her suite, as well as a sit-up machine. By the time Britney takes to the stage, her six-pack of old will be back!" the source added.