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Heart rate zones on Apple Watch and iPhone – 9to5Mac

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Heart rate zones on Apple Watch and iPhone – 9to5Mac

A handy health and fitness feature with watchOS and iOS is the ability to see your heart rate zones on Apple Watch and iPhone. Read on for what they mean, how to see your max heart rate, manually edit your zones, and more.

Apple Watch and iPhone – with watchOS 9/iOS 16 and later – automatically create your five heart rate zones based on the Heart Rate Reserve method. Max and resting values are updated automatically on the first day of each month.

Here’s how Apple describes the feature:

“Heart Rate Zones are a percentage of your maximum heart rate and are automatically calculated and personalized using your health data. On Apple Watch, Heart Rate Zones are presented in five segments—effort levels from light to increasingly harder. By monitoring your Heart Rate Zone, you can make your workout more efficient and challenge yourself to improve your fitness.”

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How to see heart rate zones on Apple Watch and iPhone

See heart rate zones during a workout

  • Make sure you’re running watchOS 9 or later on Apple Watch and also have your birthdate entered in the Health app on iPhone
  • Start a cardio-focused workout like a walk, run, or cycling (Apple hasn’t shared exactly which workout types include heart rate zones except for “cardio-focused” ones)
  • Swipe down on the first Workout screen to see your heart rate and which zone it’s in
How to see heart rate zones on Apple Watch 1

See heart rate zones after a workout

  • After a workout, head to the Fitness app on iPhone to see heart rate zone data
  • Choose a workout from the main Summary screen or tap the rings or Show More to pick a different date/workout
  • Once you’ve picked a workout, swipe down until you see Heart Rate, tap Show More

Now you’ll see the breakdown of how much time you spent in each heart rate zone:

How to see heart rate zones on Apple Watch 2

How to manually edit your heart rate zones

While the heart rate zones are automatically added based on your age, height, and weight, you can manually change them (usually for advanced athletes).

  • Head to Settings > Workout > Heart Rate Zones on your Apple Watch and choose Manual at the top
  • Or on iPhone go to the Apple Watch app > Workout > Heart Rate Zones then choose Manual at the top

How to see your max heart rate?

Going beyond your max heart rate is considered unsafe by medical professionals. To see your recommended maximum:

  • Head to Settings > Workout > Heart Rate Zones on your Apple Watch, swipe down to find your max heart rate
  • Or on iPhone go to the Apple Watch app > Workout > Heart Rate Zones, swipe down to find your max heart rate

What do heart rate zones mean?

Understanding your heart rate zones can be useful in a variety of ways. But some of the most practical applications are using heart rate training (properly rest or push yourself), targeting fat-burning or carb-burning heart rate zones, and awareness for those who have health conditions.

The Cleveland Clinic has a helpful article on understanding what kind of calories you’re burning in different zones. This won’t map directly to the five heart rate zones with Apple Watch, but is a good starting point.

Use your max heart rate (details on finding above) to figure out the numbers from the below calculations:

  • Lower-intensity zone: You’re exercising at 50% to 60% of your max heart rate. At this point, 85% of the calories you burn are fat. The downside? You’re burning fewer calories overall than you would if you were exercising at a higher intensity. You’re generally able to sustain this zone the longest amount of time.
  • Temperate zone: You’re exercising at 60% to 70% of your max heart rate. Roughly 65% of the calories you burn are fat.
  • Aerobic zone: Working at 70% to 80% of your max heart rate puts you in the aerobic zone. About 45% of the calories you burn are fat. But you’re burning a higher number of overall calories compared to the other heart rate zones. You generally sustain this zone the shortest amount of time. 

For heart rate training, the big idea is to “train your aerobic system without overstressing your skeletal and muscular systems, explains personal trainer Erin Carr.” Check out this article from Runner’s World for all the fine details:

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Fitness

Just 10 Minutes of Exercise May Help Slow Cancer Growth, New Study Suggests – Muscle & Fitness

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Just 10 Minutes of Exercise May Help Slow Cancer Growth, New Study Suggests – Muscle & Fitness

Exercise has long been known for its muscle building, heart saving, and mind stimulating benefits, but more and more research is beginning to shed light on how being active can inhibit the spread of cancer, with a new study suggesting that just 10 minutes of exercise can switch off the signals that lead to cancer growth. The study, undertaken by researchers at England’s Newcastle University and published by the JAMA Network, showed that even short burst of energetic exercise can trigger quick molecular changes within the bloodstream that can halt cancer growth and accelerate DNA repair.

How Was the Study Carried Out?

30 overweight or obese male and female volunteers aged between 50 and 78 (risk factors associated with cancer) who were otherwise healthy, were asked to complete cycling sessions for around ten minutes. Following this activity, blood samples were then taken to measure 249 different proteins, and how the intervention of exercise may have affected these proteins.

Does Exercise Lower Cancer Risk Long-Term?

The scientists discovered that 13 proteins increased after this exercise, including interleukin-6 (IL-6), a protein that is associated with DNA and damaged cell repair. “These results suggest that exercise doesn’t just benefit healthy tissues, it may also create a more hostile environment for cancer cells to grow,” said Dr. Samuel Orange, who is a Clinical Exercise Physiologist. “… it sends powerful signals through the bloodstream that can directly influence thousands of genes in cancer cells”

It is estimated that regular physical activity can reduce the risk of bowel cancer by around 20 percent. “It’s an exciting insight because it opens the door to find ways that mimic or augment the biological effects of exercise, potentially improving cancer treatment and, crucially, patient outcomes,” added Orange. “In the future, these insights could lead to new therapies that imitate the beneficial effects of exercise on how cells repair damaged DNA and use fuel for energy.”

The study also found that exercise supercharged activity in genes that support mitochondrial energy metabolism, enabling calls to use oxygen more efficiently, while genes that encourage rapid cell growth were essentially switched off, reducing the aggressiveness of cancer cells. “Even a single workout can make a difference,” commented Orange. “One bout of exercise, lasting just 10 minutes, sends powerful signals to the body. It’s a reminder that every step, every session, counts when it comes to doing your best to protect your health.”

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You Can Keep Your Health And Fitness Resolutions Without Overdoing It

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You Can Keep Your Health And Fitness Resolutions Without Overdoing It

As hopeful as New Year’s Resolutions feel when you’re making them, it can be hard to keep momentum when you’re faced with dark January days, a 5-week month and, well, the state of the world right now.

If this is ringing some familiar bells, you’re not alone. Lots of us struggle to keep going with resolutions and in fact, the second Friday of January is actually dubbed Quitter’s Day as that’s when many of us slip and give up our resolutions.

However, when it comes to health and fitness, one NHS doctor urges that focusing on small wins and having a long-term goal of understanding your body and health can be a lot more beneficial.

You don’t have to do it all at once

Dr Reem Hasan, Chief Medical Officer at Vista Health and NHS GP says: “The best health goals are the ones you can live with, small actions that build momentum and become part of your routine. Sustainable change is what truly transforms health.”

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This means you don’t have to race to join your local gym, have a 12-step fitness routine and unrealistic goals that will inevitably burn you out and put you off fitness all together.

Dr Hasan advises taking the three following steps when it comes to health and fitness:

Prioritise movement over perfection

Instead of committing to an intense daily workout, start with something manageable like a short walk during your lunch break, stretching before bed, or taking the stairs instead of the lift.

It’s still January, you still deserve to take your time.

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Dr Hasan adds: “These small bursts of activity add up and make movement part of your lifestyle rather than a short-term resolution.”

Add before you restrict

If you’re looking to make your diet healthier, Dr Hasan urgess that restriction isn’t the way forward, saying: “Rather than cutting out foods, focus on adding nutritious options like an extra portion of fruit or vegetables each day, or swapping one processed snack for a whole food alternative.

“This positive approach supports your health without triggering feelings of guilt or deprivation.”

Protect your rest

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It is something that we take for granted but actually, good sleep hygiene is essential for our day-to-day wellbeing.

Dr Hasan says: “Sleep is one of the most powerful tools for maintaining health. Set a realistic bedtime, avoid screens for at least 30 minutes before sleep, and create a calm evening routine. Rested bodies and minds make better decisions and sustain energy for other healthy habits.

“When you approach change this way, gently and consistently, you are more likely to build habits that last all year. You will feel stronger, more balanced, and may even inspire those around you to take their own small steps toward better health.”

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Fitness

These are the best fitness and nutrition apps to hit your 2026 health goals

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These are the best fitness and nutrition apps to hit your 2026 health goals

Whether you’re trying to hit New Year’s resolutions or just need a good workout or diet tracker, the best health and fitness apps can help you get there. And if you’re feeling overwhelmed (or underwhelmed) by the choices available, I’m here to share personally-tested workout and planning apps to get you started.

Some people thrive with personalized, AI-made workout or diet plans. Others benefit from social apps like Strava where challenges and “kudos” from friends keep you motivated. And you’d be surprised how a good spreadsheet or basic workout log might work better than an expensive app with videos and plans.

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