For years, high-intensity interval training (HIIT) and heavy lifting have dominated the fitness scene, pushing low-intensity cardio—also known as LISS (Low-Intensity Steady State) or Zone 2 training—into the shadows. But now, this underrated form of exercise is making a strong comeback.
What exactly is Zone 2 cardio? How do you ensure you’re doing it right? And is it really a problem if your heart rate drifts into Zone 3? Let’s break it all down.
What Is Zone 2 Training?
Zone 2 training refers to steady, low-intensity cardio. It enhances aerobic capacity (helping you run faster), improves anaerobic recovery (allowing quicker recovery between intense efforts), and serves as an efficient, low-fatigue way to burn calories.
The term “Zone 2” comes from the five-zone heart rate system, though different sports use various metrics:
- Runners call it an “easy pace” or “long slow distance” (LSD) pace.
- Cyclists often refer to it as zones 2-3 in their seven-zone system.
- Rowers and swimmers typically describe it as “low-intensity” work.
The Hallmark of Zone 2 Training
- Steady & Sustainable: You maintain a constant moderate effort throughout.
- Heart Rate Target: Roughly 60-75% of your max heart rate.
- Effort Level: Feels easy but purposeful—you should be able to hold a conversation.
- Best Activities: Running, cycling, swimming, rowing, hiking, brisk walking, or using the elliptical.
How to Find Your Zone 2
To train in Zone 2, you first need to determine your maximum heart rate (MHR). There are several ways to estimate it:
Field Test (Best for Experienced Athletes)
Sprint up a steep hill three times, pushing your hardest on the final round. The highest heart rate recorded is a solid estimate of your MHR.
Personal History (For Those Who Track HR)
If you’ve ever done high-intensity workouts (like a 5K race or HIIT session), the highest heart rate you’ve recorded during those efforts is close to your MHR.
Easy Exercise Estimate (For Beginners)
Take your heart rate at a steady, conversational pace and multiply it by 1.25.
Formula Method (Least Accurate)
The 220 – age formula is widely used but highly unreliable. It’s like asking ChatGPT to guess your shoe size—it might be close, or completely off.
Calculating Your Zone 2 Range
Once you have your MHR estimate, multiply it by 0.6 (60%) and 0.75 (75%) to find your Zone 2 range.
Example:
- If your MHR is 200 bpm → Zone 2 is 120-150 bpm
- If your MHR is 175 bpm → Zone 2 is 105-132 bpm
The Benefits of Zone 2 Training
Builds Your Aerobic Base
Zone 2 work improves your cardiovascular efficiency by increasing:
- Capillary growth (better oxygen & nutrient delivery)
- Mitochondrial density (more energy production)
- Glycogen storage (better endurance)
Enhances Strength & Recovery
For lifters, Zone 2 cardio helps with:
- Faster recovery between sets & reps
- Improved work capacity (train harder, longer)
- Better heart & lung function
And no, cardio won’t kill your gains—as long as you’re eating enough.
Supports Long-Term Health
- Lowers resting heart rate & blood pressure
- Improves metabolic efficiency
- Aids fat burning without high fatigue
Unlike HIIT or CrossFit-style conditioning, Zone 2 is low-fatigue. You can do it daily without wearing yourself out.
How to Know You’re in Zone 2
Forget the Numbers—Go by Feel
If you’re new to heart rate tracking, listen to your body instead:
- Effort Level: 3-5/10 (mild exertion, but steady)
- Breathing: Easy, not ragged or gasping
- Talk Test: You should be able to speak in full sentences without struggling for breath.
For Runners
Struggling to maintain an easy jog? Try this:
- Jog the flats, walk the hills
- Brisk walking can count as Zone 2 if you’re new to exercise
- As you get fitter, running at an easy pace will become sustainable
Frequently Asked Questions
What is Zone 2 cardio?
Zone 2 cardio is low-intensity, steady-state exercise where your heart rate stays around 60-75% of your max, promoting endurance and fat burning.
How do I determine my Zone 2 heart rate?
Multiply your estimated max heart rate (220 minus your age) by 0.6 to 0.75 to find your Zone 2 range in beats per minute.
What are the best exercises for Zone 2 cardio?
Activities like brisk walking, jogging, cycling, rowing, swimming, or elliptical workouts work well, as long as you maintain a steady effort.
How long should I do Zone 2 cardio?
Ideally, aim for 30-60 minutes per session, 3-5 times per week to maximize endurance and cardiovascular benefits.
Can I do Zone 2 cardio every day?
Yes! Since it’s low-intensity, you can do daily sessions without excessive fatigue, even on recovery days.
Conclusion
Zone 2 cardio is a low-intensity, steady-state form of exercise that enhances aerobic capacity, aids recovery, and improves overall endurance. It involves maintaining a moderate effort level—typically around 60-75% of your max heart rate—where you can comfortably hold a conversation without gasping for breath.
To do Zone 2 cardio correctly, choose a steady, repetitive movement like running, cycling, swimming, rowing, brisk walking, or using an elliptical. The key is to keep your heart rate consistent within the Zone 2 range, avoiding spikes into higher intensity zones.
