Pop superstar Britney Spears is embarking on a strict exercise regime - because she's finding it difficult to keep up with backing dancers on her Onyx HOTEL TOUR.

The I'M A SLAVE 4 U singer is struggling to cope with the demanding performance routines, and some onlookers are surprised at just how out of shape she really is.

One fan tells British magazine STAR, "It was kind of gross. She was drenched in sweat and out of breath from her dance moves."

An insider says, "She gets lots of massages and manicures. They distract her from the corn chips and cocktails."

17/03/2004 17:27