E-Books › 30 Core Workouts Volume 1 Image 1 of 1 30 Core Workouts Volume 1 $10.00 Build a strong midline with these 30 epic core workouts that helped be become a 5 times CrossFit Games athlete. Purchase Added! Build a strong midline with these 30 epic core workouts that helped be become a 5 times CrossFit Games athlete.