Pop icon Madonna does it, while actresses Julianne Moore, Kim Cattrall and Teri Hatcher are said to swear by it. It’s credited with getting celebrity mother Gwyneth Paltrow back into toned and honed shape following the birth of her children, while a host of other A-list celebrities have given it the thumbs up.

What is it? It’s the latest must-do fitness regime to arrive in the UK from the States.

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