01/17/2012 03:47 pm ET

Margot Campbell: Toning Tips From Pippa Middeleton's Pilates Instructor

When it emerged that Ms. Middleton regarded Pilates lessons as "something of a weekly necessity," her teacher, Margot Campbell, was besieged by journalists and publishers waving large cheques, desperate to know how she had single-handedly sculpted the "rear of the year."

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