A great way to get a good ab workout is with an ab wheel.
Ab Roller Will Seriously Work Your Core—Here's How to Use One
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Strengthen Your Core with the 8 Best Ab Roller Exercises Now – DMoose
9 Ab Roller Benefits: How Effective Is It? – Torokhtiy Weightlifting
How Effective Is an Ab Wheel Roller? Benefits of Ab Rollouts – DMoose
Top 5 Weighted Abs Exercises for a Lean, Shredded Core - Muscle & Fitness
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After how long can an ab wheel give you a 6 pack? - Quora