Core Strength for 50+: A Customized Program for Safely Toning Ab

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Core Strength for 50+, Book by Karl Knopf

Core Strength for 50+: A Customized Program for Safely

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Core Strength for 50+: A Customized Program for Safely Toning Ab

Core Strength for 50+, Book by Karl Knopf

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A 30-day workout to tone and strengthen your core