Madonna and Gwyneth Paltrow are rumoured to use Callanetics - and

Followers claim that the lifting and tightening effect of one hour of the U.S. fitness fad is equal to 20 hours of aerobics.

Gwyneth Paltrow and Beyoncé Have Apparently Fallen - Lorcan O

Gwyneth Paltrow & Madonna: Claridge's Catch-Up: Photo 2461205

Jimmy Fallon: From Madonna to Gwyneth Paltrow: The celebrities

Gwyneth Paltrow and Beyoncé Have Apparently Fallen - Lorcan O

Jimmy Fallon: From Madonna to Gwyneth Paltrow: The celebrities

Madonna's MANY feuds exposed - including spats with Gwyneth, Cher

In Praise of Chaotic Workout Attire

From Madonna to Gwyneth Paltrow: The LA work-outs that will fast

Gwyneth reignites feud with Madonna, says she's got a better six

Madonna & Gwyneth Paltrow

Madonna and Gwyneth Paltrow are rumoured to use Callanetics - and

Rumor has it- Madonna and Gwyneth Paltrow have been best friends