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  1. Strengthen Your Core with this 30-Day Ab Challenge - Shape

  2. The 30-Day Abs Challenge to Carve Your Core - Muscle & Fitness

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

  4. 30-Day AB Challenge (With Free Printable) - The Quiet Grove

  5. The 30-Day Abs Challenge for a Strong Core | livestrong

  6. 30-Day Ab Challenge: Printable Calendar & Core Strengthening

  7. 30-Day Ab Workout Challenge - Sunny Health and Fitness

  8. 30-Day Ab Challenge: Designed By A CPT - Garage Gym Reviews

  9. Beginner 30-Day Ab Workout Challenge + Workout Calendar

  10. Ultimate 30 Day Ab Challenge That Works - Get Fit with Cedar