Phys Flex Is Closed + Nerdy Gift Inside


The doors are locked.
The metabolic circus has left town.

The Physiologic Flexibility Certification is officially closed until March 2026.

If you’re one of the glorious weirdos who enrolled—congrats.
You’re now part of the rare tribe that trains the four core adaptive systems instead of just sets, reps, and macros.
CO₂. O₂. Temp. pH.

The unsexy physiology that makes you harder to kill, and freakishly resilient when life—or training—decides to throat-punch you.

I’m fired up to get started with all of you.

Expect your nervous system to feel like it’s gone through Jedi bootcamp by the end of this round.

If you missed this one—no panic hyperventilating required (save that for the breathwork module). The next round opens March 2026. Mark it, tattoo it, or tape it to your caffeine stash.

Now for your nerd treat:
I’ve got a brand-new article from Experience Life Magazine where I was interviewed on AI, wearables, and we discuss if you should outsource your physiology to your wrist computer?

Grab the full PDF here:
👉 Download the “AI and Our Health” article (PDF)

It dives into how artificial intelligence is creeping into fitness, diagnostics, and even mental health—and why your own internal feedback loop still trumps any algorithm.
My favorite line from the piece:

“Data is good. But it’s not going to replace how you feel.”
Darn right.

Enjoy the full PDF and let me know what you think!

Much love, lactate, and lightheadedness,
Dr Mike

Creator of the Flex Diet Cert & Phys Flex Cert
Kiteboarder • Lifter of odd objects • Metal-music nerd

_____________________

Mike T Nelson CISSN, CSCS, MSME, PhD
Associate Professor, Carrick Institute
Owner, Extreme Human Performance, LLC
Editorial Board Member, STRONG Fitness Mag

Mike T Nelson is a PhD and not a physician or registered dietitian. The contents of this email should not be taken as medical advice. It is not intended to diagnose, treat, cure, or prevent any health problem - nor is it intended to replace the advice of a physician. Always consult your physician or qualified health professional on any matters regarding your health.

..

Dr Mike T Nelson

Creator of the Flex Diet Cert & Phys Flex Cert, CSCS, CISSN, Assoc Professor, kiteboarder, lifter of odd objects, metal music lover. >>>>Sign up to my daily FREE Fitness Insider newsletter below

Read more from Dr Mike T Nelson

Recently, I sat down with Jeremy to dig into one of my favorite topics—how to separate fitness reality from the endless stream of social-media pseudoscience and tribalism. We unpack why chasing celebrity physiques misses the point, why training stimulus beats “perfect” nutrition every time, and how to approach progressive overload without getting lost in dogma. Both of us have worked with everyone from professional athletes to busy executives, and this conversation pulls from those...

Welcome to the Flex Diet Podcast! In this episode, I’m sharing a special rebroadcast of my conversation with Dr. Mikki Williden, where we dive deep into the concept of physiologic flexibility — what it is, why it matters, and how to train it. We cover everything from metabolic flexibility and heat and cold exposure to sauna use, cold therapy, and how your body handles lactate during exercise. I also break down the science behind buffering systems like beta-alanine, and how improving your CO₂...

At first blush, it sounds like a sadistic joke that you need more stress in your life.“More stress?Screw you, nerd — my life’s already a flaming dumpster of deadlines, sleep deprivation, and caffeine-fueled anxiety. Why the hell would I want more?” I get it.You don’t need more Zoom calls, more rage from your boss, or more existential dread at 2 AM. But here’s the physiological plot twist:You do need more stress — just the right kind. The Right Kind of Stress Not All Stress Is Created Equal...