20-Minute Circuit Back, Abs and Glutes Core Power Workout « Exercise Menu- Fitness Articles, 500 Rep and 20-Minute Circuit Workouts by Jacques Courseault, M.D.

20-Minute Circuit Back, Abs and Glutes Core Power Workout « Exercise Menu- Fitness Articles, 500 Rep and 20-Minute Circuit Workouts by Jacques Courseault, M.D.: "Your core muscles are arguably the most important muscles to exercise. Your back, abs and glutes not only are responsible for maintaining posture, but also support your body when performing upper body or lower body exercises. For example, you cannot properly biceps curl a challenging weight if you have trouble standing up straight to do it"

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