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.

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

Gwyneth Paltrow and Madonna new gym buddies

Madonna And Gwyneth Paltrow Turn Out For Yoga Charity 'Bent on

In Praise of Chaotic Workout Attire

Low-carb diets favored by Gwyneth Paltrow, Madonna and Jennifer

Gwyneth Paltrow & Madonna: Claridge's Catch-Up: Photo 2461213

Madonna & Gwyneth Paltrow

Gwyneth Paltrow Ended Her Friendship With Madonna For This Reason

Crunch time for Madonna and Gwyneth Paltrow in battle of the gyms

Jimmy Fallon: From Madonna to Gwyneth Paltrow: The celebrities

In Praise of Chaotic Workout Attire

Is Gwyneth Paltrow's friendship with Madonna over?

Pre-K Games to Play in Gym

Low-carb diets favored by Gwyneth Paltrow, Madonna and Jennifer

Madonna & Gwyneth