ZONE 2 TRAINING
Not every workout needs to leave you breathless, red-faced and counting down the seconds until it ends. In fact, one of the biggest fitness conversations right now is built around doing almost the opposite: slowing down.
Welcome to Zone 2 training, the low-to-moderate intensity cardio trend that has been embraced by runners, cyclists, fitness trackers, endurance athletes and everyday exercisers looking for a smarter, more sustainable way to build fitness.
At its simplest, Zone 2 is exercise performed at a steady pace where your heart rate sits at around 60 to 70 per cent of your estimated maximum heart rate. You are working, but not gasping. You can talk in short sentences. You feel warm, your breathing has lifted, but you are not pushing into that “I need to stop soon” territory. Cleveland Clinic describes Zone 2 as moderate-intensity aerobic exercise within the second level of a five-zone heart rate system.
Why Everyone Is Talking About It
For years, fitness culture has often celebrated the hardest workout in the room. High-intensity interval training, bootcamps, sweat-heavy sessions and “no pain, no gain” messaging have all had their moment. While higher-intensity exercise absolutely has benefits, it is not always the easiest place to start, and it is not always the most sustainable option for people juggling work, family, fatigue, injury history or simply a dislike of punishing workouts.
Zone 2 training offers a different approach. It says you can improve your fitness without smashing yourself every session. You can walk briskly, cycle steadily, swim comfortably, row lightly or jog slowly and still be doing meaningful work for your heart, lungs and muscles.
So, while Zone 2 may sound like a fitness trend, its biggest strength may be its simplicity: it gives people a realistic way to move more often.
We Need to Move More
The World Health Organization reports that around 31 per cent of adults globally, or approximately 1.8 billion people, do not meet recommended physical activity levels. Physical inactivity also increased by about five percentage points between 2010 and 2022, and if current trends continue, adult inactivity is projected to rise to 35 per cent by 2030.
The highest rates of physical inactivity were observed in the high-income Asia Pacific region (48%) and South Asia (45%), with levels of inactivity in other regions ranging from 28% in high-income Western countries to 14% in Oceania.
In Australia, the Australian Institute of Health and Welfare reports that 37 per cent of adults aged 18 to 64 are insufficiently physically active, while 57 per cent of adults aged 65 and over are insufficiently active. Physical inactivity is also the ninth leading preventable cause of ill health and premature death in Australia, responsible for 2.5 per cent of the total disease burden in 2018.
What Is Actually Happening in Zone 2?
Zone 2 is primarily an aerobic training zone. That means your body is using oxygen to help produce energy. At this pace, your effort is steady enough that you can keep going for a longer period of time, which makes it ideal for building endurance and consistency.
The “talk test” is often the easiest guide. If you can hold a conversation but would not want to sing, you are probably close. If you are puffing too hard to speak, you have likely drifted into a higher zone.
Heart rate can also help. A wearable device may estimate your heart rate zones, but these are not perfect. Mayo Clinic notes that moderate exercise intensity is generally around 50 to about 70 per cent of maximum heart rate, but maximum heart rate is only a guide and can vary from person to person. Fitness level, medications and health conditions can also affect heart rate response.
So your smartwatch can be useful, but it should not be treated as the boss of your body. How you feel still matters.
The Big Benefits
The first big benefit of Zone 2 training is that it is approachable. For many people, the hardest part of fitness is not knowing what to do; it is doing it consistently. Lower-intensity training can feel more manageable, especially for beginners, people returning to exercise, or those who feel intimidated by high-intensity workouts.
It is also a great way to build your aerobic base. Think of your aerobic base as your fitness foundation. The stronger it is, the easier everyday activities tend to feel, from climbing stairs to walking longer distances, playing sport or recovering between harder workouts.
There is also evidence that moderate-intensity continuous training can support meaningful physiological adaptations. A 2026 systematic review and meta-analysis in PLOS One found that moderate-intensity continuous training significantly improved mitochondrial volume density and VO₂ max in adults, although the authours noted that the overall certainty of evidence was low and more research is needed.
That is an important point. Zone 2 is useful, but it is not magic. The science does not suggest that everyone should only train in Zone 2, or that it is automatically superior to all other forms of exercise. A more balanced view is that Zone 2 is one valuable tool in the fitness toolkit, particularly because it allows people to accumulate more movement with less strain.
Is It Good for Fat Burning?
This is where Zone 2 often gets a little overhyped.
At lower intensities, the body uses a higher proportion of fat as a fuel source compared with very high-intensity exercise, where carbohydrates become more dominant. That has led to Zone 2 being promoted online as a “fat-burning” shortcut.
But fat burning during a workout is not the same as long-term fat loss. Body composition changes still depend on overall energy balance, nutrition, training consistency, sleep, stress and strength training. Zone 2 can absolutely support weight management as part of a broader healthy lifestyle, but it should not be sold as a miracle metabolism hack.
How Much Should You Do?
For general health, the current Australian 24-hour movement guidelines recommend that adults do moderate to vigorous physical activity for 30 minutes or more on most days, muscle-strengthening activities on two or more days per week, and several hours of light physical activity daily. They also recommend limiting and breaking up long periods of sitting.
Zone 2 training can fit neatly into these recommendations. For example, someone might aim for:
· Three 30-minute brisk walks each week
· One longer weekend walk, cycle or swim
· Two strength sessions
· Regular movement breaks during the workday
For beginners, even 10 to 15 minutes at a comfortable pace can be a good starting point. The goal is not to be perfect. The goal is to build a rhythm you can repeat.
What Counts as Zone 2?
Zone 2 can be done in many ways, which is part of its appeal. You might choose brisk walking, cycling, swimming, hiking, rowing, elliptical training, light jogging or a steady session on a treadmill with a gentle incline. The best option is the one you are most likely to keep doing.
A good Zone 2 session should feel controlled. You should finish feeling like you have trained, but not like you have emptied the tank.
Who Should Be Careful?
Zone 2 training is generally accessible, but it is still exercise. Anyone with heart disease, chest pain, unexplained shortness of breath, dizziness, a major medical condition, or anyone returning to exercise after a long break should speak with a GP or qualified health professional before starting.
It is also worth checking in if your heart rate seems unusually high or low for the effort you are doing, particularly if you take medications that affect heart rate.
Zone 2 training has become popular because it feels like a welcome reset. It moves fitness away from punishment and back towards consistency. It reminds us that exercise does not have to be extreme to be effective.
This article is general information only and is not a substitute for personalised medical advice. Speak with a GP, exercise physiologist or qualified fitness professional before starting a new exercise program, especially if you have an existing health condition or injury.
By: Chris Rabba, July 26