A good exercise heart rate falls between 50% and 85% of your maximum heart rate, depending on how hard you want to work. For a 40-year-old, that means roughly 90 to 153 beats per minute (bpm). For a 60-year-old, it’s about 80 to 136 bpm. The lower end of that range covers moderate activity like brisk walking, while the upper end reflects vigorous effort like running or cycling uphill.
Your maximum heart rate is estimated by subtracting your age from 220. That gives you the ceiling, and the “good” range sits within it based on your goals. Here’s what that looks like across age groups.
Target Heart Rate by Age
The American Heart Association provides a straightforward table based on the 220-minus-age formula. Moderate-intensity exercise lands at about 50% to 70% of your max, while vigorous exercise pushes you to 70% to 85%.
- Age 20: Target range of 100 to 170 bpm (max of 200)
- Age 30: Target range of 95 to 162 bpm (max of 190)
- Age 40: Target range of 90 to 153 bpm (max of 180)
- Age 50: Target range of 85 to 145 bpm (max of 170)
- Age 60: Target range of 80 to 136 bpm (max of 160)
- Age 70: Target range of 75 to 128 bpm (max of 150)
These numbers give you a solid starting point, but they’re estimates. Two people the same age can have very different fitness levels, which means the same heart rate might feel easy for one and exhausting for the other. If you want a more personalized number, the heart rate reserve method (covered below) gets you closer.
What the Five Heart Rate Zones Feel Like
Heart rate zones break the range between rest and your maximum into five tiers. Each one corresponds to a different level of effort, and each has a different purpose in a training plan.
Zone 1 (50% to 60% of max) is warm-up and cool-down territory. You can hold a full conversation without any trouble. This zone works well for recovery days when you want to move without stressing your body.
Zone 2 (60% to 70%) is where most steady, longer cardio sessions live. You can still talk, but you might pause mid-sentence to catch your breath. This is the classic endurance-building zone, and it’s where many people spend the bulk of their workout time to improve cardiovascular fitness while keeping injury risk low.
Zone 3 (70% to 80%) feels comfortably hard. Breathing picks up noticeably, and chatting drops off. Training here builds both strength and endurance, and it’s a common target for tempo runs, moderate group fitness classes, and sustained efforts on a bike or elliptical.
Zone 4 (80% to 90%) pushes toward your limit. Talking takes real effort. You’re building speed and power here, but you can only sustain this intensity for shorter bursts, typically during interval training.
Zone 5 (90% to 100%) is an all-out sprint. You’re gasping, not speaking. This zone strengthens your heart by forcing it to work at peak capacity and builds fast-twitch muscle fibers for explosive power. Most people can hold zone 5 for only 30 seconds to a couple of minutes.
For general health, you don’t need to train in zones 4 and 5. Spending time in zones 2 and 3 during most workouts delivers the cardiovascular benefits that matter for long-term health. Higher zones are useful if you’re training for performance goals, but they’re not a requirement.
A More Personalized Calculation
The 220-minus-age formula treats everyone the same age as identical, which they obviously aren’t. A more accurate approach is the heart rate reserve method, sometimes called the Karvonen method. It factors in your resting heart rate, which reflects your current fitness level.
The formula is simple: subtract your resting heart rate from your maximum heart rate. That difference is your heart rate reserve. A fitter person with a lower resting heart rate will have a larger reserve, meaning their heart has more room to ramp up during exercise.
To find your target, multiply your heart rate reserve by the percentage you’re aiming for (say, 60% for moderate effort), then add your resting heart rate back in. For example, a 40-year-old with a resting heart rate of 65 bpm has a max of 180 and a reserve of 115. At 60% intensity, that’s (115 × 0.60) + 65 = 134 bpm. Compare that to the standard formula, which would put 60% of max at just 108 bpm. The difference is meaningful, and the heart rate reserve method tends to match how hard the workout actually feels.
To get your resting heart rate, check your pulse first thing in the morning before getting out of bed. Do it for a few consecutive days and average the numbers. Most healthy adults land between 60 and 100 bpm at rest, with fitter individuals often falling between 40 and 60.
Why Your Heart Rate Might Run Higher Than Expected
If your heart rate seems too high for the effort you’re putting in, the environment could be the reason. High temperatures and humidity cause your body to send more blood to the skin for cooling, which forces your heart to beat faster. In hot, humid conditions, your heart may circulate roughly twice as much blood per minute as it would on a mild day. That means a workout that normally keeps you in zone 2 could push you into zone 3 or 4 without any change in pace.
Dehydration, caffeine, poor sleep, and stress can all inflate your exercise heart rate too. If your numbers seem off on a given day, these factors are worth considering before you assume something is wrong.
When Medications Change the Rules
Beta-blockers, commonly prescribed for high blood pressure and certain heart conditions, directly limit how high your heart rate can climb. If you take one, you may never reach your calculated target heart rate no matter how hard you push. That doesn’t mean the workout isn’t effective. It just means heart rate alone isn’t a reliable gauge of intensity for you.
The alternative is a perceived exertion scale, such as the Borg Rating of Perceived Exertion. Instead of tracking beats per minute, you rate how hard the workout feels on a numerical scale based on your breathing, fatigue, and overall effort. Most workouts should feel “somewhat hard,” meaning they take work but you can keep going. An exercise stress test can also help establish a personalized target heart rate that accounts for the medication’s effects.
Warning Signs to Take Seriously
Your heart rate climbing during exercise is normal. That’s the whole point. But certain symptoms alongside a high heart rate signal something different. Chest pain, dizziness, lightheadedness, fainting, heart palpitations, or unusual shortness of breath during exercise are all reasons to stop immediately. These are especially important if they’re new for you or feel different from your usual exertion.
An irregular pulse is also worth paying attention to. If your heartbeat feels erratic or skips in a way that’s unfamiliar, that’s a change worth getting evaluated. The heart rate number itself matters less than whether the pattern is abnormal for you.