AbMat Sit-Ups (Diamond Sit-Up) Build Strength and Endurance With

Lie on your back, and open your legs into a diamond shape (aka butterfly legs) with the soles of your feet pressed together and knees out wide. Extend your

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ABMAT Sit Up Mat- The Original Abdominal and Core Trainer Mat for Full Range of Motion Sit ups, Crunches and Ab Workouts Black Vinyl : Sports & Outdoors

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