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Plank Knees In and Out

Posted by GymAmerica
Tuesday, April 3, 2012 at 5:39pm filed under Abdominals

Calories Burned:  408 calories per hour   (based on a body weight of 150 lbs.)
Primary Muscles Trained:  Rectus Abdominis
Secondary Muscles Trained:  Obliques
Focus on proper form.

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