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.

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Madonna Friends List of Madonna's Best Friends

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

Why are Madonna and Gwyneth no longer friends? Madonna made a move

Jimmy Fallon: From Madonna to Gwyneth Paltrow: The celebrities

Madonna & Gwyneth Paltrow

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

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

AM/PM Callanetics (Official DVD)

Gwyneth Paltrow and Madonna leaving their gym London, England

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