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15 Minute Fitness: 100 quick and easy exercises * Strengthen and tone, improve core fitness* Fat burning aerobic workouts (Try It!): Martin, Suzanne, Baker, Efua: 9780241282885: Amazon.com: Books
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Amazon.com: ABS! 50 of the Best core exercises to strengthen, tone, and flatten your belly. eBook : Vanes, Howard: Kindle Store
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