Mike T Nelson

Mike T Nelson Mike T Nelson, CISSN, CSCS, MSME, PhD, metabolism & fitness expert specializing in improving body comp and performance in athletes. Flex Diet Cert

Stop worshipping at the soft blue altar of Zone 2 cardio.According to the internet mitochondrion GooRoos, apparently eve...
06/03/2026

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).

06/03/2026

Think PRs only mean lifting heavier? Think again.

Progress can also be about increasing your total volume or density with a given weight. I hit 24 reps in 36 mins vs. 19 reps in 19 mins—that's a win!

05/28/2026

Most HRV research relies on single morning measurements, but overnight trackers offer better compliance. If accuracy is key, a morning spot check might be superior. I'm testing Elonga for this purpose.

05/25/2026

The term 'CO2 tolerance' might be misleading. What's actually happening is a desensitization to the physical sensations, seen in reduced respiratory rates with nasal breathing.

It's a hypothesis backed by new research and anecdotal experience, challenging conventional understanding.

05/24/2026

Did you know your breathing rate is a key indicator of stress? New research reveals how respiratory rate spikes are linked to non-metabolic stressors like cold, heat, and even emotions.

It's more than just breathing; it's your body's alarm system.

05/24/2026

Are you tired of hearing about complex fitness mechanisms that don't actually deliver results?

Many people discuss supplement, training, and peptide mechanisms (like creatine's effect on heat production) without concrete human outcomes. While mechanisms are interesting for research, they don't always translate to real-world benefits like fat loss or muscle gain.

Be critical of explanations that only focus on 'how it works' and not 'what it does'. Let's discuss what actually matters.

05/07/2026

Breathing and moving are our top priorities for survival. To move effectively, you need hip flexion. This essential movement is so vital, it's prioritized above all else in our survival system.

04/11/2026

Feeling like an imposter? Start by imagining your future, confident self. What would they do daily? Act like that person now, even if it feels like faking it. Consistency transforms it into your reality.

04/08/2026

Struggling with insulin-resistant PCOS? Focus on balancing blood sugar with protein-heavy meals, especially breakfast. Regular movement like walks and strength training are key. A coach can help manage cravings and psychological aspects of eating.

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