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  1. Core (anatomy) - Wikipedia

  2. Core of the Body: Function, Muscles, and Exercises - WebMD

  3. Core Muscles - Physiopedia

  4. Core exercises: Why you should strengthen your core muscles

  5. What Are Core Muscles? The Role of Each Core Muscle ... - Shape

  6. Exercises to improve your core strength - Mayo Clinic

  7. A Guide to Your Core Muscles, from a PT - HSS

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