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  1. This 30-Day Plank Challenge Will Strengthen Your Entire Core - Shape

  2. 30-Day Core Challenge - Bodybuilding.com

  3. The 30-Day Ab Challenge Will Strengthen Your Entire Core - Shape

  4. The Best 30-Day Ab Challenge (Ideal for Men and Women)

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  7. 30 Day Ab Challenge: Sculpt Your Core In 4 Weeks With These …

  8. 30-Day Core Sculpting Challenge: Strengthen Your Core for …

  9. 30 Day Core Challenge | Abs, Glutes and Hips - RunToTheFinish

  10. 30-Day Ab Challenge | Core Strength Exercises - Runner's World