In this short Flex Diet Podcast episode, I share a reminder that the PhysFlex Surge enrollment closes Monday, April 27, 2026 at midnight PST, and I give more context on what’s inside the PhysFlex Certification. I explain how Level 1 (Flex Diet Cert) covers nutrition and recovery basics, while Level 2 (Physiologic Flexibility) focuses on becoming more robust and resilient by improving the four pillars of homeostatic regulation: temperature, pH, fuels (including ketones), and air (managing oxygen and CO2).

I walk through my eustress vs distress model, why most interventions work better with lower intensity and higher frequency, and how misapplying tools like cold immersion, sauna, or breathing methods can backfire without the right context.

Episode Sponsor:

• Physiologic Flexibility Certification: https://physiologic.miketnelson.com/sales

Available now:

• Grab a copy of the Triphasic Training II book I co-wrote with Cal Deitz here.

Episode Chapters:

• 00:17 PhysFlex Surge Deadline
• 01:10 Who the Cert Is For
• 01:55 Four Pillars Overview
• 02:31 Time Cost and Zone 2
• 03:16 Sauna and Cold Progression
• 04:16 Eustress Versus Distress
• 05:01 Training Frequency Principles
• 07:43 Course Structure Breakdown
• 08:30 Research Meets Application
• 09:29 Context Matters Example
• 12:32 When Interventions Backfire
• 14:29 Wrap Up and Reminder
• 15:12 Medical Disclaimer

Get In Touch with Dr Mike:

• Instagram: https://www.instagram.com/drmiketnelson/
• YouTube: https://www.youtube.com/@flexdietcert
• Email: Miketnelson.com/contact-us