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The STRONG System: Transform Your Mindset and Build Your Best Body at Any Age
Break free from yo-yo dieting, endless restarts, and cookie-cutter fitness plans. The STRONG System, created by fitness expert Cori Lefkowith, founder of Redefining Strength, is a proven, science-backed blueprint for lasting results.
Forget fad diets and extreme workouts. The STRONG System combines mindset training, sustainable habits, and adaptable fitness and nutrition strategies so you can make progress that sticks. STRONG stands for Significant, Targeted, Repeatable, Optimized, Nonnegotiable, GO! —a powerful framework that has transformed thousands of lives.
Inside you will
Mindset mastery to stay motivated and consistentPersonalized planning that adapts as you doSustainable routines for long-term resultsMetabolic muscle-building protocols and macro-cycling tipsWorkout plans, progress trackers, and recovery strategies Features &
Proven Expertise – Created by Cori Lefkowith, founder of Redefining Strength, with over a decade of client-tested success.Customizable Approach – Build fitness and nutrition plans designed for your unique needs, not a one-size-fits-all template.Mindset-First Method – Learn to stay consistent and break free from the cycle of starting over.STRONG Framework – Six pillars that deliver results you can sustain for life.Science-Backed Strategies – Includes muscle-building protocols, macro-cycling, and recovery tips.Adaptable for Any Age or Stage – Smart, sustainable methods that evolve with you.Complete Toolkit – Plans, progress trackers, and habit systems to keep you on track.Total Transformation – Build strength, confidence, and habits you can maintain for years.Whether you are starting from scratch or breaking through a plateau, The STRONG System helps you cut through the noise, train smarter, and create a lifestyle you can sustain for life.
Forget fad diets and extreme workouts. The STRONG System combines mindset training, sustainable habits, and adaptable fitness and nutrition strategies so you can make progress that sticks. STRONG stands for Significant, Targeted, Repeatable, Optimized, Nonnegotiable, GO! —a powerful framework that has transformed thousands of lives.
Inside you will
Mindset mastery to stay motivated and consistentPersonalized planning that adapts as you doSustainable routines for long-term resultsMetabolic muscle-building protocols and macro-cycling tipsWorkout plans, progress trackers, and recovery strategies Features &
Proven Expertise – Created by Cori Lefkowith, founder of Redefining Strength, with over a decade of client-tested success.Customizable Approach – Build fitness and nutrition plans designed for your unique needs, not a one-size-fits-all template.Mindset-First Method – Learn to stay consistent and break free from the cycle of starting over.STRONG Framework – Six pillars that deliver results you can sustain for life.Science-Backed Strategies – Includes muscle-building protocols, macro-cycling, and recovery tips.Adaptable for Any Age or Stage – Smart, sustainable methods that evolve with you.Complete Toolkit – Plans, progress trackers, and habit systems to keep you on track.Total Transformation – Build strength, confidence, and habits you can maintain for years.Whether you are starting from scratch or breaking through a plateau, The STRONG System helps you cut through the noise, train smarter, and create a lifestyle you can sustain for life.
432 pages, Paperback
Published January 27, 2026
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Displaying 1 - 1 of 1 review
October 3, 2026
I really wanted to like this book, because I like Cori's YouTube channel, and she seems to genuinely understand strength-training (her own body is testimony to this!). I primarily bought this book not because I want to lose weight but for getting better ideas on effective weight-lifting workouts. I've been lifting weights at home for a couple of years, but without the guidance of an experienced trainer, it's difficult to know whether I'm lifting optimally or how I can best improve.
The first 25% of the book is about building realistic expectations and goals so that you are set to build consistent habits rather than treating dieting and/or weight-lifting as a fad that only lasts so many weeks before you give up. Cori explains why she writes at length about motivation, except that I have fairly good motivation already, and my principle issue is not about a history of fad diets. Thus, I felt fatigued with such a long introductory message. I wish I'd had a better sense of a preview of the book before I bought it.
The other issue I have with the book is that it's often confusing. As we start to get into the weights section of the book, Cory introduces the 6-12-25 method, but takes a long time to get to what it actually is, and when it is explained, it's not entirely clear because it's combined with explanations and terms related to other things. I think I would need to read the 6-12-25 section about twenty times (especially in the e-book format where I can't add physical stickies or underlines) in order to get exactly what it is and how I should approach it. In contrast, it's much easier to grasp concepts when Cori is explaining and demonstrating in one of her YouTube videos. I'm a relative beginner to weights workout terminology, and I feel this could have been presented more accessibly, especially when the first quarter of the book seems positioned to someone who has not yet got into a proper weights routine.
I'm only half-way through this book, but I feel like I've retained nothing that I've read, and I'm unsure whether to keep going :(
I dunno... I think this book could have done with a better editor's eye, although I appreciate that the writing is clearly very much Cori's voice and I respect her ownership of this book's content. I just don't think it's the easiest content for a novice to grasp. I would have suggested presenting an introduction to weights and exercise concepts/terms, then an illustrated workout plan that covers a week or more, then adding a section on diet and macros at the end.
The first 25% of the book is about building realistic expectations and goals so that you are set to build consistent habits rather than treating dieting and/or weight-lifting as a fad that only lasts so many weeks before you give up. Cori explains why she writes at length about motivation, except that I have fairly good motivation already, and my principle issue is not about a history of fad diets. Thus, I felt fatigued with such a long introductory message. I wish I'd had a better sense of a preview of the book before I bought it.
The other issue I have with the book is that it's often confusing. As we start to get into the weights section of the book, Cory introduces the 6-12-25 method, but takes a long time to get to what it actually is, and when it is explained, it's not entirely clear because it's combined with explanations and terms related to other things. I think I would need to read the 6-12-25 section about twenty times (especially in the e-book format where I can't add physical stickies or underlines) in order to get exactly what it is and how I should approach it. In contrast, it's much easier to grasp concepts when Cori is explaining and demonstrating in one of her YouTube videos. I'm a relative beginner to weights workout terminology, and I feel this could have been presented more accessibly, especially when the first quarter of the book seems positioned to someone who has not yet got into a proper weights routine.
I'm only half-way through this book, but I feel like I've retained nothing that I've read, and I'm unsure whether to keep going :(
I dunno... I think this book could have done with a better editor's eye, although I appreciate that the writing is clearly very much Cori's voice and I respect her ownership of this book's content. I just don't think it's the easiest content for a novice to grasp. I would have suggested presenting an introduction to weights and exercise concepts/terms, then an illustrated workout plan that covers a week or more, then adding a section on diet and macros at the end.
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