“David Deppeler brings clarity, nuance, and a refreshing dose of honesty to the world of breath training. His work integrates deep clinical insight with a practical, accessible style that makes the science usable—whether you’re an athlete, coach, or simply someone trying to breathe better. Through his contributions to Oxygen Advantage, particularly in the area of swimming and breathwork, David has helped push the field forward. Breathwork Exposed is a powerful, timely resource that strips away the hype and brings the focus back to what truly works.” —Patrick McKeown, Founder of Oxygen Advantage and bestselling author of The Oxygen Advantage

Deppeler has cracked the code for breathwork and handed us an owner’s manual. What he has been able to do with many of my professional runners is nothing short of profound. His work has helped my runners find more efficiency, durability, confidence and performance potential. This isn’t wellness fluff, it’s performance gold

“This work is a game-changer. David and the Breathe Your Truth system helped me see how powerful breathwork is for recovery and performance—without extra tech or cost. We were able to see some pretty immediate results and the BYT methods fit in seamlessly to our everyday training."

“This book doesn’t just teach you to breathe—it guides you back to the wisdom of your own body.” — Lee Holden, Bestselling Author of Ready, Set, Slow!

I’ve always trained hard and paid attention to every variable, but a recurring side stitch kept showing up late in races—and nothing seemed to fix it. Then I found Breathe Your Truth. David’s approach helped me understand the deeper mechanics and chemistry of breath. Through his on-demand education, I retrained my system to breathe efficiently under pressure. That shift changed everything. I’ve hit new personal bests—and haven’t had a side stitch since.

David’s work bridges a long-overdue gap between performance, pelvic health, and breath. He has a rare gift for making the complex feel intuitive. This book is equal parts practical and eye-opening—offering a roadmap I wish more professionals and patients had in their hands. Breathe Your Truth is a refreshing shift from hype to true depth.

Through the lens of science and clinical insight, David has captured the living heart of breathwork long revealed by ancient traditions. Breathwork Exposed brings coherence to the vast, often overwhelming world of breath practices—honoring their roots while offering clear, grounded guidance for modern seekers. This is a rare and valuable contribution to the evolving field of breath.

Most swimmers don’t realize how much better they could be—until they learn to breathe right. When David worked with our Peachtree City team from Chattahoochee Gold, the impact was immediate. Our athletes moved better, recovered faster, and swam with more control. Breathwork Exposed takes complex science and makes it usable. Every coach and swimmer should have this on their shelf.

David’s work brings breath back to life. As a physician, I’ve seen countless approaches to breathing, but what he offers through Breathe Your Truth is different—deeply human, refreshingly clear, and quietly transformative. The way he weaves breathwork and Qi Gong is not only elegant, it’s effective. I return to his teachings again and again because they work. Breathwork Exposed is a brilliant extension of his gift: grounded, insightful, and filled with tools that can truly shift how we feel and function.

Of all the healing paths I’ve explored, this breathwork journey has been one of the most meaningful. I only wish I’d found it sooner. Despite breath being essential to life, I spent years without truly knowing mine. Through David Deppeler’s thoughtful and accessible teaching and writing, I was invited to slow down, meet my breath more consciously, and explore its quiet power. His grounded teaching—rich with science, biomechanics, and practical insight—has not only deepened my personal practice, but reignited my professional passion. His work has become a trusted companion and a fresh source of inspiration on my path of healing, growth, and breath.

David has been a trusted collaborator and knowledgeable educator in our yoga community for over 20 years. Breathwork Exposed beautifully blends breath science with the wisdom of yoga, challenging industry-wide misperceptions and opening the door to more a easeful, intelligent, embodied approach to yoga practice. This book is essential for anyone ready to breathe—or teach—with greater clarity and depth.

David’s work has been a cornerstone in my own breathwork journey—personally helpful and professionally clarifying. As a psychologist, I’ve found Breathwork Exposed to be a rare gem: it brings scientific rigor and real-world application together in a way that supports both healing and growth. I now integrate these principles into my clinical practice with clients navigating anxiety, trauma, and burnout—and have seen remarkable results, including helping individuals significantly reduce or even eliminate panic attacks. This book is an invaluable guide for anyone—practitioner or provider—ready to understand the breath beyond the hype.