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Hollow Rock Hyperextensions

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

Calories Burned:  272 calories per hour   (based on a body weight of 150 lbs.)
Primary Muscles Trained:  Rectus Abdominis
Secondary Muscles Trained:  Spinal Erectors
1. Lie flat on your back on an exercise mat, your hands over your head (on the mat).
2. Curving yourself like a turtle on its back, rock back and forth in a controlled manner, making sure that the movements come from your abdominal contractions.

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