That famous behind doesn't come easy. From leisurely jogs to full-on triathlons, see how the Duchess of Cambridge's kid sister stays fit
Credit: Chris Brunskill/Getty
Updated: Thursday Sep 01, 2011 | 06:00 AM EDT
By: Alex Apatoff
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Heidi, Pippa, Kate and more stay toned simply by playing in the snow!
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Pippa Middleton proves she can beat the boys, looking remarkably refreshed as she crosses the finish line during the GE Blenheim Triathlon in Woodstock, England, in June.
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