DyeHard’s “A Guide To Developing A Shredded Core” is a step by step Ebook that teaches you exactly how to develop your core muscles. This Ebook is FREE when you subscribe to DyeHard Fitness. This subscription is also a free process and only requires you to sign up to our newsletter. Fill out Ebook popup on the home page to access this Ebook. If the popup is not showing anymore, clear your browser cookies and reload the website.