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David Kirsch has worked with "The Body" (Heidi Klum), "The Boobs" (Kate Upton) and has been called the "Master of the Ass. Today, the accomplished trainer shares one of his signature toners, the sumo lunge.
The sumo lunge is a combination of three movements: a roundhouse, a side kick and a frog jump. Kirsch describes it as a thigh-shaper, butt-lifter and sculpter. Learn from the master, above, with our step-by-step video.
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