A good zone 2 heart rate falls between 60% and 70% of your maximum heart rate. For most people, that translates to a pace that feels easy but purposeful, where you can hold a conversation without gasping but still feel like you’re working. The simplest way to estimate your max heart rate is 220 minus your age, then multiply by 0.60 and 0.70 to get your personal zone 2 range.
How to Calculate Your Zone 2 Range
Start with the basic formula: subtract your age from 220. That gives you an estimated maximum heart rate. Then take 60% and 70% of that number to find your zone 2 boundaries.
If you’re 40 years old, your estimated max heart rate is 180 bpm. Zone 2 would be 108 to 126 bpm. A 30-year-old would aim for 114 to 133 bpm. A 55-year-old would target 99 to 115 bpm.
This formula is a starting point, not gospel. It doesn’t account for your fitness level, medications, or genetics. A more personalized approach uses heart rate reserve, sometimes called the Karvonen method. You subtract your resting heart rate from your max heart rate, take 60% to 70% of that number, then add your resting heart rate back in. This adjusts the range based on how fit your heart already is. Someone with a resting heart rate of 55 will get a different (and more accurate) zone 2 range than someone resting at 75, even if they’re the same age.
What Zone 2 Actually Feels Like
Numbers on a watch are helpful, but the most reliable real-world check is the talk test. In zone 2, you should be able to speak in full sentences. Not effortlessly, like you’re sitting on the couch, but without needing to pause every few words to catch your breath. If you can sing, you’re probably too low. If you can only get out a few words at a time, you’ve drifted into zone 3.
On a perceived exertion scale of 0 to 10, zone 2 lands around 4 to 5: moderate, somewhat hard. Your breathing is noticeably faster than at rest, you’re sweating lightly, and your muscles are engaged but not burning. On the classic Borg scale (6 to 20), that’s roughly 11 to 13, somewhere between “light” and “somewhat hard.”
Many people are surprised by how slow zone 2 feels at first. If you’re used to pushing hard during workouts, staying in zone 2 may require you to walk on hills, slow your jog to a shuffle, or dial back resistance on a bike. That’s normal and expected.
Why Formulas Can Be Off
The 220-minus-age formula has a wide margin of error. Your true max heart rate can be 10 to 15 beats higher or lower than the estimate, which means your calculated zone 2 range could be significantly off in either direction.
Smartwatches that estimate lactate threshold (a key physiological marker that separates easy from hard effort) aren’t perfectly accurate either. A study published in Frontiers in Physiology tested three major brands against lab results and found average errors of about 9 to 11 bpm for lactate threshold heart rate, with individual errors sometimes much larger. That’s enough to put you in the wrong zone entirely.
The gold standard is a lab-based lactate test, where you exercise at increasing intensities while a technician measures lactic acid in your blood. Zone 2 sits just below the first lactate threshold, the point where lactate begins to accumulate beyond its resting level of roughly 1 to 2 millimoles per liter. These tests typically cost $100 to $250 and are available at sports performance clinics and some gyms. If you don’t want to go that route, combining the heart rate formula with the talk test gives you a reasonable working range. When the two methods disagree, trust how your body feels.
What Zone 2 Training Does for Your Body
Zone 2 sits at the intensity where your muscles rely heavily on fat for fuel rather than stored carbohydrates. Training here builds your aerobic base: the network of tiny blood vessels feeding your muscles (capillarization), the efficiency of your energy-producing mitochondria, and your heart’s ability to pump blood with less effort over time. An expert consensus published in the International Journal of Sports Physiology and Performance identified increased muscle capillarization, improved mitochondrial enzyme activity, and better metabolic efficiency as the primary adaptations.
It’s worth keeping expectations realistic, though. Zone 2 creates a relatively low metabolic disturbance compared to harder efforts. Higher-intensity training activates the cellular signaling pathways that drive mitochondrial growth more powerfully. Meta-analyses have found that low-intensity exercise produces smaller mitochondrial improvements than interval training. That said, zone 2 has clear benefits that harder training doesn’t replicate as well: it places far less strain on muscles, tendons, and ligaments, it’s sustainable day after day, and it builds the aerobic foundation that makes higher-intensity work possible. Most well-designed training plans use both.
How Much Zone 2 Training You Need
The most common recommendation from sports scientists and longevity-focused physicians is 150 to 200 minutes per week. That breaks down to roughly 30 minutes a day, five or six days a week. This volume is enough to meaningfully improve cardiovascular health without interfering with strength training or leaving you worn out.
If you’re just starting, begin with 20 to 30 minutes per session and add 5 to 10 minutes each week. Because zone 2 is low intensity by definition, it’s forgiving on the body. Some people eventually build to 4 to 6 hours per week, and endurance athletes commonly do long zone 2 sessions of two hours or more. The risk of overtraining at this intensity is very low as long as you’re genuinely staying in zone 2 and not creeping higher.
Walking, cycling, swimming, rowing, and light jogging all work. The activity matters less than staying in the right intensity range. If jogging pushes your heart rate above zone 2, there’s nothing wrong with brisk walking, especially on an incline. The goal is time spent at the right effort level, not the type of exercise.
Quick Reference by Age
- Age 25: 117 to 137 bpm
- Age 30: 114 to 133 bpm
- Age 35: 111 to 130 bpm
- Age 40: 108 to 126 bpm
- Age 45: 105 to 123 bpm
- Age 50: 102 to 119 bpm
- Age 55: 99 to 116 bpm
- Age 60: 96 to 112 bpm
- Age 65: 93 to 109 bpm
These are estimates based on the 220-minus-age formula at 60% to 70%. Your actual zone 2 could be higher or lower depending on your fitness and individual physiology. Use these as a starting range, then adjust based on how the effort feels. If you can’t talk comfortably, slow down. If it feels like barely any effort at all, pick up the pace slightly.