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Tutorials from David Duncan

4 videos · 196K views

How to Properly Do Dumbbell Oblique Crunches [oblique & core exercise]

David Duncan124K views

How to Do Reverse Sit Ups [lower back exercise]

David Duncan50K views

How To Earn a College Football Scholarship - What You Really Need To Know

David Duncan21K views

How to Do Hip Abductor Exercise

David Duncan1.2K views

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