Heart Rate Variability (HRV): Don't think good or bad. Think parasympathetic (rest/recovery) vs. sympathetic (stress). This shift helps you decide your next move, whether it's recovery or performance. #HRV #HealthTech

High-protein Pop-Tarts? While protein is crucial (aim for 0.7g/lb bodyweight), prioritize real foods like yogurt. Don't chase synthetic protein in processed snacks; focus on what actually had eyeballs on it. #Protein #Nutrition #HealthyEating

Think Zone 2 cardio is king for VO2 max? Think again. Doing less, but doing it smarter with intervals, could be the real game-changer. Don't just trust me – test it yourself! #Fitness #TrainingTips #VO2Max

Donating blood helps your community AND your health. It can lower high iron markers like hematocrit, especially beneficial for males. Plus, it's a great way to give back! #BloodDonation #HealthTips

Scientists presenting research at an ADA conference were escorted out, despite the research being published in the ADA's own journal. This incident raises serious concerns about censorship within science, especially as NIH funding is drastically cut.

For most people, Zone 2 training is a waste of time. Elite endurance athletes are the exception; for everyone else, it doesn't deliver the desired results. #Fitness #Training

Most HRV research uses single morning measurements, not overnight tracking. Overnight devices win on compliance, but morning spot checks offer more accuracy for a true resting state.

It seems everyone's a peptide dealer now, even without a background in physiology. While some peptides can be helpful, they aren't a replacement for fundamental work like exercise, nutrition, and sleep. Focus on the basics: consistency and effort. #Peptides #Health

Forget peptides and more protein. The ultimate recovery hack? Boost your aerobic capacity (VO2 max). Recovery is active and requires energy, primarily from your aerobic system. Improve it with just 6 minutes a day. #FitnessTips #Recovery

RPE is helpful for gauging exercise intensity, but it shouldn't replace tracking your actual output. Aim for your RPE and heart rate to remain consistent while your output increases over time. This shows true adaptation and improvemen

Most guys chase fairy-dust supplements to send their test to the moon. What matters: how much it works × whether you'll actually take it. I call it Coaching Leverage™. My Men Over 40 Summit talk breaks it down. Free, Thurs 6/11: menover40healthsummit.com/a/… #ad

Vinegar, guts, gainZ, and nonsense our gut is not a magical compost pile with Wi-Fi. Despite what the microbiome prophets and probiotic carnival barkers keep screaming, gut health is not solved by sprinkling fermented fairy dust on your lunch. Training matters. Nutrition matters. Stress matters. Context matters. In this episode of the Flex Diet Podcast, I sit down with Dr. Emily Dow, PhD, RD, to dig into the messy intersection of resistance training, nutrition, vinegar, glucose control, and gut health. The Vinegar Rabbit Hole Emily’s dissertation looked at a 12-week resistance training program combined with a vinegar intervention. Main gut permeability outcomes? Limited. Yet the exploratory findings were the juicy nerd candy: possible strength improvements, potential cognitive benefits, and mechanistic pathways involving acetate metabolism, NAD salvage, and AMPK signaling. Translation: vinegar is not magic sour water, but it may poke some interesting metabolic buttons under the right conditions. Listen to the full episode below miketnelson.com/podcast/gut-…

Stop worshipping at the soft blue altar of Zone 2 cardio. According to the internet mitochondrion GooRoos, apparently everyone now needs 2-3 hours of nasal-breathing monk laps or your body will file a grievance with the longevity gods. A narrative review in Sports Medicine from Storoschuk, Moran-MacDonald, Gibala, and Gurd (2025), walked into the Zone 2 temple carrying a gas can and a lit Marlboro. The claim? Zone 2 is the optimal intensity for building mitochondria. That claim does not survive contact with the actual data by hardcore nerds. The signaling evidence was small, inconsistent, or missing like a gym owner when the HVAC bill shows up. They did find that harder efforts above Zone 2 did more for mitochondrial adaptation and cardiorespiratory fitness. This is great news specially when your training time is limited and you are not living inside a Scandinavian endurance lab with unlimited daylight, fermented fish, and a lactate meter glued to your hand. Translation: Zone 2 cardio is not magic. Several longevity influencers may now spill their electrolyte water into their cold plunge and can safely remove the red light from their keester. They highlighted another issue: Zone 2 may fall below the moderate-intensity threshold used in physical activity guidelines. If you trade all your harder cardio for easy nose-breathing laps because a podcast told you "mitochondria Bro," you might be leaving the biggest health returns on the table. That is not "optimization". It is underdosing dressed up as precision guided BS on a pogo stick. Now, before the Zone 2 zealots start clawing drywall, yes — Zone 2 has value. Easy aerobic work can help fat oxidation. Recovery cost stays low. Untrained, overweight, beat-up, or low-capacity humans can use it as a smart entry point.. ..but it is absolutely not the glowing mitochondria chalice of eternal life. Want my free cardio protocol that actually matches the evidence and does not require you to cosplay as a retired Tour de France domestique? Comment CARDIO below and I'll send it to you. It starts at only 6 minutes per day. Much love and bigger engines, Dr Mike PS — Comment CARDIO and I will DM you the Progressive 6 Protocol (P6P).

Progress in lifting isn't just about lifting heavier (1RM PR). Consider volume (more reps at a set weight) or density (more work in less time). Increasing any of these shows you're making gains.

Most HRV research uses single morning measurements, not overnight tracking. Overnight devices win on compliance, but morning spot checks are more accurate. I'm testing Elonga for its solid, single-point morning readings. Check it out miket.me/elonga (affiliate link)

The term 'CO2 tolerance' might be misleading. It's likely a desensitization to respiratory sensations, not a change in CO2 levels. Even leading researchers are unsure of the term's validity.

Respiratory rate is a key stress indicator, even more sensitive than heart rate variability. It spikes with non-metabolic stressors like cold, emotion, or cognitive load, while tidal volume adjusts to metabolic needs. New tech could soon measure this via earbuds.

Fitness advice often obsesses over mechanisms, not outcomes. Citing how a supplement *might* work (like creatine causing 'futile cycling' for fat loss) is cool, but lacks human data. Don't assume a cool mechanism guarantees real results.

Just published: "Creatine As A Fat Burner? Easy There, Lab Coat Cowboy". Check it out and subscribe to get everything I'm making. flex-diet.kit.com/posts/crea… via @kit