Tonight at midnight PST, this whole thing disappears. Cart shut. Lights out. Digital corpse. No extension or “can you leave it open another day?”If you are a well-intentioned procrastinator who meant to enroll, got distracted by some cold-plunge clown on Instagram, and woke up tomorrow with regret, dry lips, and 17 tabs open, now is the time. Gone is gone. Unti Fall 2026. That’s the deal. And before this thing turns into smoke and bad decisions, here’s what vanishes with it: All 4 pillar...
about 9 hours ago • 1 min read
Happy Sunday from S. Padre Island, where I'm working away, waiting on the wind. As you've noticed, I've been pummeling your neurons all week. You've survived a week of my unloading a significant portion of my brain into your inbox on temperature, pH, lactate, ketones, CO2, cross-adaptation, and one Canadian firefighter whose heart rate hit 190 in a burning building. That's a lot of physiology for a week. Some of you read every word, and I'm sure a few of you got three deep and then life...
1 day ago • 1 min read
I want to tell you about Andrew Martin. Andrew is a firefighter in Canada, which already puts him several levels above the average physiology dork pontificating about “resilience” from a climate-controlled office with a laptop, an Oura ring, and the emotional intensity of damp toast. He’s been collecting heart-rate data during actual emergencies. Not lab-coat pageantry on a moving belt. This was not a simulation cooked up in a lab with ethics forms, safety rails, and some intern holding a...
3 days ago • 5 min read
In this episode, I sit down with respiratory and sleep scientist Martin McPhilimey to take a deep dive into breathing, CO₂ regulation, and how they actually impact performance, stress, and sleep. We get into why respiratory physiology is way more complex than most people think, how his clinical and research background shaped his approach, and why breathwork exploded during COVID with names like Wim Hof and James Nestor. From there, we dig into allostatic load and why piling on high-stress...
3 days ago • 1 min read
CO2 is not what you think it is. Neither is your pump pre-workout. A few years ago I watched a very fit, very serious athlete fall apart in a repeated sprint test like a luxury sedan losing all four wheels on the freeway. On paper, he looked bulletproof. Strong.Lean.Well-trained.The kind of athlete who makes coaches say stupid things like, “Yeah, he can handle anything.” Except he couldn’t. First 60 sec sprint on the Concept 2 evil rower looked good.Second sprint looked fine.Power at the...
4 days ago • 4 min read
Quick one tonight because the AMA audio series dies at midnight, but you can still hop in https://miket.me/physflex <--full details And before it dies, I need to tell you about the metabolic basement. Most people walk around using two fuels: Glucose and fat. That’s enough to keep the lights on. Enough to get through a normal day, to fake competence, and to survive mediocre training and decent sleep and a life that hasn’t started swinging a bat yet. But downstairs? There are two more systems...
4 days ago • 3 min read
Your heart is running on lactate right now. Yep, it is true, yet nobody told you. There’s a certain kind of coach I keep running into. Smart. Reads studies. Programs decent work. Probably has a whiteboard covered in percentages like he’s planning a military coup against weak glutes after watching "A Beautiful Mind" too many times. Then one of his athletes starts fading under repeated hard efforts. Legs get heavy. Power falls off. Face turns into that thousand-yard stare you only see in war...
5 days ago • 3 min read
Lactic acid didn’t do it. Your buffering system got mugged. There’s a certain kind of coach I’ve met a thousand times. Good intentions. Solid heart of 14 karat gold. Probably owns at least 3 overpriced recovery gadget and still says “lactic acid” like it’s 1997 and we’re all wearing Zubaz pants in a Gold’s Gym parking lot with his gallon of distilled water. ...but then his athletes starts dying halfway through a brutal set of intervals, and they spit out the same line that’s been passed...
5 days ago • 4 min read
What up you savage? I wanted to take a slight round-a-bout from our technical breakdown to answer a bunch of questions that came in about the Phys Flex Cert… ..and to remind you that the Fast Action Bonus of your 1 hour private call (a legit $250 value) with your truly nerdy here closes tonight, Wed April 22 at midnight PST. Story time as just today a coach named Chris emailed me some solid questions. Then another coach emailed me. Then another one. By the third round, I realized I was...
6 days ago • 7 min read