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Core Strength: ¡Tu guía definitiva para el entrenamiento básico!
"Core Strength: Your Ultimate Guide To Core Training!
Strengthen your core muscle to build a better body.
The Complete Step By Step Guide to a Stronger Body & Better Posture for Men & Women.
The best core exercises may surprise you. It's not enough to just do ab crunches and sit ups. To build a strong core you need to exercise a variety of muscles, from your hips to your shoulders.
Develop a stronger core with these beginner, intermediate and advanced exercises."