The "Design It Yourself" workbook by Judy Kessinger is a valuable resource for individuals interested in the "FitNice System" for designing a personalized fitness plan. The book, written in English and originating from the United States, provides users with a step-by-step guide to creating their own fitness program tailored to their specific needs and goals. With a focus on design and IT, this workbook allows users to take control of their fitness journey and create a plan that is both effective and efficient.