Heart rate zones are a measurable reference that shows what percentage of your maximum your heart is working at, rather than guessing how hard a session feels. They are also one of the most reliable ways to choose the right intensity in group classes. These zones explain why you end up gasping for breath in an O'Hiit class while your pulse stays calm during a yoga session. In this article we explain how the zones are calculated, which class at O'Wellness Beytepe matches which zone, and how you can monitor your heart rate during a class.

What are heart rate zones

Heart rate zones are a five-step system divided according to specific percentage ranges of your maximum heart rate. Each step changes how the body produces energy and which physiological goal the training serves. In the lower zones the body mainly uses fat as fuel; in the upper zones it relies more heavily on carbohydrate stores and anaerobic energy systems. This distinction is the basis of the idea that not every workout has to be equally exhausting, because different zones serve different purposes.

Area	Percentage of maximum	Common name	Feel
Zone 1	%50-60	Very light	You can talk comfortably, it feels almost like resting
Zone 2	%60-70	Light-moderate	You can talk but your breathing becomes noticeable
Zone 3	%70-80	Medium-high	Long sentences become hard, steady breathing is essential
Zone 4	%80-90	High	Short sentences, a clear sense of effort
Zone 5	%90-100	Maximum	Talking is almost impossible, sustainable only briefly

The simplest estimate of maximum heart rate is the "220 minus age" formula. It is not a laboratory measurement but a rough approximation, and it can vary from person to person. For a 35-year-old, for example, the estimated maximum is about 185 beats per minute; for this person Zone 3 corresponds roughly to 130-148 beats per minute.

The Karvonen formula: factoring in resting heart rate

Taking a straight percentage of the maximum gives a quick estimate, whereas the Karvonen formula also factors in your resting heart rate and produces a more personal result. The logic is this: first you find the heart rate reserve, the difference between maximum and resting heart rate; then you take the target percentage of that reserve and add the result back to the resting heart rate.

Estimate your maximum heart rate (220 – age).
Measure your resting heart rate; for the most accurate result, count for 60 seconds in the morning before getting out of bed.
Calculate your heart rate reserve: Maximum – Resting.
Apply the target percentage to the reserve and add the resting rate: (Reserve × Target %) + Resting.

Consider a 35-year-old with a resting heart rate of 60: the reserve is 185 – 60 = 125. For 70%, the lower limit of Zone 3, the calculation (125 × 0.70) + 60 comes to about 148 beats per minute. The Karvonen method is often preferred because it gives more realistic results than the simple percentage method, especially for people with a low resting heart rate who are generally fitter. Whichever you choose, these calculations only provide a general framework; if you have a heart or vascular condition, be sure to consult your doctor before determining your target zones.

Which class matches which zone at O'Wellness Beytepe

Every group class has its own intensity profile, and that profile determines which zone you will spend most of the class in. The table below is a general roadmap; your personal fitness level and how hard you choose to push on the day can change the outcome.

Class	Dominant zone	Profile
O'Hiit	Zone 4-5	Short high-effort / rest cycles, near maximum at the peaks
Tabata	Zone 4-5	Fixed protocol, repeated near-maximal bursts
O'Ride Cycle	Zone 3-5	Transitions between zones through tempo changes and climb blocks
Cardio Kickbox	Zone 3-4	Moderate-high, continuous pace through combination sequences
Step Cardio	Zone 3	Rhythmic, continuous movement with less fluctuation
Total Body	Zone 2-3	Strength-focused moderate intensity with a cardiovascular component
Mobility & Stretching	Zone 1	Low intensity, focused on the nervous system and joints
Vinyasa / Balanced Yoga	Zone 1-2	Breath and movement flow, mild cardiovascular stimulus

For anyone who wants to balance their weekly schedule by zone, this table is a practical starting point. If your goal is to raise your overall fitness, planning classes that target different zones together brings far more sustainable results than getting stuck at a single intensity. The high-tempo classes in the O'Rise studio and the calmer sessions in the O'Soul studio make this balance easy to build.

How to track your heart rate: watch and manual method

To actually use the zones you need to monitor your heart rate. There are two basic ways to do this: a heart rate watch or chest strap, and manual measurement.

Heart rate watch or chest strap

A heart rate watch or chest strap provides live data during class and lets you see which zone you are in, in real time. In classes where intensity changes quickly, such as cycle and HIIT, having a numerical reference instead of a rough guess helps prevent both under- and overloading. These devices are not mandatory, but they are a useful tool for anyone who regularly targets a specific intensity.

Manual measurement

If you do not have a device, you can count your pulse at the inside of your wrist or the side of your neck for 15 seconds and multiply the result by 4 to estimate beats per minute. This method is less precise, and finding your pulse by hand right after an intense effort takes a little practice. Still, it gives you a rough idea without any device.

Rating of perceived exertion

A practical option for those who do not use a heart rate device is the 1-10 rating of perceived exertion. 1-2 represents rest, 5-6 a moderate effort where you can still talk but your breathing becomes noticeable, and 8-9 a high effort where you cannot say more than a few words. Although subjective, this scale is an easy way to bring zone logic into class.

Minute by minute: zone transitions in an O'Ride Cycle class

To make it concrete how zones rise and fall within a single class, let's look at the flow of a typical 45-minute cycle session.

Minutes	Section	Target zone
0-5	Warm-up, light pedalling	Zone 1-2
5-15	Tempo blocks, flat road simulation	Zone 2-3
15-25	Climb block, increased resistance	Zone 3-4
25-35	Attacks (sprint intervals)	Zone 4-5
35-40	Recovery pedalling	Zone 2
40-45	Cool-down and stretching	Zone 1

This structure shows how deliberate transitions between zones give a class a storyline: from warm-up to the peak, and from there to a controlled recovery. The same logic applies in different proportions to O'Hiit and Cardio Kickbox; although the length of effort and rest periods varies, the principle of moving between zones stays the same.

Level variations: the target zone depends on the person

Beginner level

For beginners, the priority is not to force themselves into the upper zones but to find a sustainable pace between Zone 2 and 3. Lowering resistance or movement speed during the most intense parts of the class so as not to go above Zone 3 offers a start that is both safe and sustainable in the long run. It can take a few weeks for the body to adapt to these intensities.

Intermediate level

Participants who have reached a certain level of fitness can work between Zone 3 and 4 in the main blocks of the class and briefly reach Zone 5 at the peaks. The goal at this stage is to gradually extend the time spent in the upper zone.

Advanced level

Experienced participants can stay longer between Zone 4 and 5 and shorten their recovery intervals. At this level, how quickly the heart rate returns to normal after effort, the recovery rate, becomes an important indicator of fitness.

Common mistakes

Always staying in the same zone: Working in Zone 2 all the time is comfortable but eventually slows progress; constantly pushing Zone 5 prevents recovery and increases injury risk.
Skipping the warm-up and going straight to an upper zone: Starting intense effort without letting the heart rate rise gradually puts a sudden load on the cardiovascular system.
Misreading heart rate data: Rather than fixating on a single momentary reading on your watch, it is more meaningful to look at the trend across the class as a whole.
Pushing through rest intervals as well: Not deliberately lowering your heart rate in the recovery segment after Zone 4-5 means you enter the next intense block already tired.
Mistaking estimation formulas for exact data: "220 – age" and the Karvonen formula are general approaches; they may deviate from your true maximum heart rate due to individual differences.

Who it is not suitable for / points of caution

Training by heart rate zones is generally a safe method, but some situations require extra care. People with a history of cardiovascular disease, uncontrolled high blood pressure, a diagnosed arrhythmia, or who take medication affecting heart rhythm should always consult their physician before starting classes that target the upper zones, such as O'Hiit, Tabata or intense cycle. Target zones may also change during pregnancy; in this period your doctor's advice comes first. Because some medications such as beta blockers directly affect heart rate, heart-rate-based intensity calculations may be misleading for people taking them; in such cases the perceived exertion scale is a more reliable guide. As a general rule, if you feel chest pain, unusual dizziness or shortness of breath, take a break from class and inform your instructor if necessary.

Weekly zone combination: a sample schedule

Spreading different zones across the week supports both performance development and recovery. The example below is designed for a participant aiming for general fitness and can be adapted to personal goals.

Day	Class	Dominant zone
Monday	O'Hiit	Zone 4-5
Tuesday	Mobility & Stretching	Zone 1
Wednesday	O'Ride Cycle	Zone 3-4
Thursday	Total Body	Zone 2-3
Friday	Cardio Kickbox	Zone 3-4
Saturday	Step Cardio	Zone 3
Sunday	Full rest or a light walk	Zone 1

In this distribution, low and moderate zone days are placed between the upper zone days (Monday, Wednesday, Friday). This prevents high intensity from piling up on consecutive days and leaves the body room to recover. Those who want a light walk on Sunday can choose popular Ankara walking spots such as the area around Hacettepe's Beytepe campus or Lake Eymir.

How to measure progress

Heart rate zones are also useful for measuring fitness development over time. If your heart rate stays progressively lower at the same effort, for example staying in Zone 3 at a cycle pace that put you in Zone 4 a few weeks ago, it is a sign that your cardiovascular system is working more efficiently. Another important indicator is recovery rate: how quickly your heart rate returns to resting level after an intense segment usually improves with regular training. For those who do not use a device, the same session feeling easier over time is an indirect but reliable sign of progress. Reviewing these measures every few weeks keeps motivation alive and helps you adjust your programme when needed.

Integrating the zone approach with your group class choices

Heart rate zones are not a formula on their own but a framework that gives meaning to all of your group class choices. Knowing which class serves which zone lets you build your weekly schedule deliberately rather than at random. To see how the class formats differ and explore all the options, take a look at our group classes page. If you want to track your fitness development in a more structured way, you can also benefit from the sports physiotherapist and dietitian support within our private services.

Zone-based training at O'Wellness Beytepe

O'Wellness Beytepe offers a wide range of classes in the Yaka Beytepe complex in Çankaya, with its O'Rise and O'Soul studios, from high-intensity O'Hiit and O'Ride Cycle to calm yoga and mobility sessions. This variety provides a solid base for anyone who wants to build a weekly schedule by heart rate zones. If you are not sure which class is in the right zone for you at our club, a few minutes from Çayyolu, Ümitköy and Hacettepe's Beytepe campus, you can get guidance from our instructors during a free facility tour and trial session. Follow our weekly schedule for current class times.

Frequently asked questions

Do I need a heart rate watch to calculate my heart rate zones?

No. Manual pulse measurement or the perceived exertion scale also gives a general idea; however, in classes where intensity changes quickly, such as cycle and HIIT, a heart rate watch provides much clearer, real-time data.

Which class at O'Wellness Beytepe is best for reaching a high heart rate zone?

O'Hiit and Tabata are designed to reach Zone 4-5 through short, intense effort intervals. O'Ride Cycle can also reach similar intensities with its climb and attack blocks.

Is staying in Zone 2 enough, or is it essential to reach the upper zones?

It depends on your goal. For general health and endurance, training mainly in Zone 2 may be enough; if you want to push your fitness limits, adding classes that reach Zone 4-5 to your week is beneficial.

Is the 220 minus age formula accurate for everyone?

No, this formula is a general estimate and may deviate from your true maximum heart rate because of individual differences. For a more personal approach, the Karvonen formula with a resting heart rate measurement can be used; consult your physician for a precise assessment.

Can I join high-zone classes if I have a heart or blood pressure condition?

If you have a history of cardiovascular disease, uncontrolled high blood pressure or a similar condition, you should always consult your physician before starting high-intensity classes.

To find the class in the right heart rate zone for you together, you can reach us through our contact page and schedule your free trial session.

Heart Rate Zones: Finding the Right Intensity in Group Classes