The Physiologic Flexibility Certification
The Physiologic Flexibility Certification (Phys Flex) is your roadmap to building resilient, “anti-fragile” clients who recover faster, adapt better, and stick with their training long term.
While most coaching focuses on workouts, nutrition, and sleep, this course goes deeper, teaching you how to train the body’s core regulators of stress and adaptation.
What You’ll Learn
The 4 Physiologic Flexibility Systems essential for performance and recovery:
It covers the 4 key Physiologic Flexibility systems, temperature regulation, blood pH, blood glucose, and O₂/CO₂ balance, for recovery and performance.
Proven interventions
you can apply right away, including breath work, cold & heat exposure, intermittent fasting, carb timing, HIIT, Zone 3 cardio, and more
How to program discomfort for growth
turning stress into opportunity
A big-picture
understanding of homeostatic regulators, and how to apply them in practice
100% online, self-paced learning
with lifetime access
Who It’s For
Trainers and coaches
ready to go beyond workouts and nutrition to build deeper resilience in clients
Fitness pros
who’ve mastered the basics but want to add powerful recovery and adaptation tools
Athletes
aiming to enhance recovery, performance, and stress tolerance
Dedicated learners
looking to improve their own physical and emotional robustness
Why Dr. Mike Created This Course
Even with solid training and nutrition, many clients still struggled with stress and recovery. Dr. Mike found that adding tools like breath work, cold exposure, and carb timing created breakthroughs in performance and resilience. The Physiologic Flexibility Certification turns these methods into a simple, science-based system you can use with confidence.
Dr. Mike T. Nelson, PhD, CSCS, CISSN, is a researcher, educator, and coach known for turning complex physiology into practical tools. With 20+ years of experience, he’s helped athletes, military, and everyday clients improve performance and recovery.
And yes, he kiteboards and loves heavy metal.
Testimonials
I can honestly say Dr. Mike is one of the smartest guys I know. He’s dedicated his life to learning everything about nutrition and strength.
If I’m stuck, he’s the first guy I call. And don’t think he’s all books—he kiteboards and loves heavy metal too.
Angelo Sisco, CEO, Alpha Hippie
After more than 2 years of CrossFit, I thought I’d never be able to do a strict pull-up.
After working with Dr. Mike and changing my programming, I can easily do several in a row! I highly recommend his work.
Suzie Glassman, Coach, Trainer, Mom
