Recently, there’s been a lot of noise around Zone 2 training. Podcasts, social media clips, and wearable tech dashboards are all telling people they must be spending hours moving slowly if they want to be healthy, lean, and fit for life.
The problem?
Most people don’t know what to do with this information, and many are starting to replace the training that actually builds resilience with long, low-intensity sessions that feel productive but deliver limited results.
Let’s be clear from the start: Zone 2 training is not bad. It can be extremely useful. But context matters — and for most people, it should be an addition, not the foundation.
What Is Zone 2 Training (Briefly)?
Zone 2 refers to low-intensity aerobic work, usually performed at roughly 60–70% of max heart rate, where you can maintain a conversation but feel like you’re working. Think steady cycling, incline walking, easy jogging, or rowing at a sustainable pace for 30–90 minutes.
The benefits often promoted include:
- Improved aerobic base
- Increased fat oxidation
- Better mitochondrial efficiency potentially
- Lower stress and faster recovery
All of which sound great — and in the right situation, they are.
Where Zone 2 Actually Shines
Zone 2 training works best in two specific contexts:
- Beginners
For people who are very deconditioned, Zone 2 is a safe, accessible way to build basic aerobic fitness, improve movement tolerance, and establish consistency. - Well-trained athletes
Endurance athletes and hybrid competitors use Zone 2 to increase training volume without accumulating excessive fatigue, allowing them to support higher-intensity sessions elsewhere in their program.
In both cases, Zone 2 is supporting something bigger, not replacing it.
The Mistake Most People Are Making
What we’re seeing now is people with limited training time:
- Skipping strength training
- Avoiding intensity
- Replacing productive discomfort with long, slow cardio
All in the name of “health.”
This is where the hype gets dangerous.
Strength is never a weakness.
And if we’re talking about long-term health, body composition, injury prevention, and real-world functionality, strength training and higher-intensity work should remain the priority.
What the Research Actually Says
A 2025 narrative review from McGill University and partner institutions directly challenges the idea that Zone 2 training is the optimal or superior method for improving metabolic health.
Key findings from the review:
- Zone 2 is not superior to higher-intensity training for improving mitochondrial density or function
- HIIT and harder efforts often produce greater cardiometabolic benefits in less time
- For trained individuals, relying heavily on Zone 2 alone leads to minimal improvements in VO₂ max or lactate threshold
- Zone 2 is beneficial, but not a panacea
The takeaway from the researchers was clear:
If your goal is to maximize fitness efficiently, higher-intensity training needs to be prioritized, not avoided.
What This Means for Real People
If you train 3–5 days per week, your priorities should look like this:
- Strength training
Building and maintaining muscle improves insulin sensitivity, bone density, joint health, posture, and longevity. - High-intensity conditioning
Intervals, metcons, sprints, circuits — this is where VO₂ max, power, and metabolic flexibility are truly challenged. - Zone 2 as an add-on
If you want more movement, more recovery, or extra volume without crushing your nervous system, Zone 2 fits perfectly here.
Zone 2 is the side dish, not the main course.
A Better Way to Think About Zone 2
Instead of asking, “Should I be doing Zone 2?”
Ask:
- Do I already strength train consistently?
- Do I include some intensity in my week?
- Do I have the time and recovery capacity to add more?
If the answer is yes, Zone 2 can be a great tool.
If the answer is no, Zone 2 won’t fix the absence of strength, intensity, or structure.
The Bottom Line
Zone 2 training is useful — but it has been oversold as a universal solution.
For most people:
- Strength builds the foundation
- Intensity drives adaptation
- Zone 2 supports the system
Train hard. Train strong. Add Zone 2 on purpose, not out of fear.
Because while aerobic fitness matters, strength is never a weakness — and it should never be replaced.
