How Much Exercise Really Protects Your Heart?

Is 150 Minutes of Exercise Really Enough?

For many working professionals, the answer seems simple: 150 minutes of exercise a week, and my heart is covered. This is the standard weekly activity target recommended for adults, and reaching it is certainly a good step towards better heart health.

But is 150 minutes the point where the benefits stop?

Not quite. New research suggests that while 150 minutes of moderate activity each week can lower cardiovascular risk, the protection may become substantially greater at much higher levels of activity. Some findings point towards roughly 9 to 10 hours of exercise a week being associated with a much larger reduction in cardiovascular risk.

So, How Much Exercise Really Protects Your Heart? The answer is more nuanced than simply reaching a weekly number.

In this blog, we will look at what the research says about standard and higher levels of activity, why your fitness level matters, and how busy professionals can gradually increase their activity without feeling overwhelmed.

Standard vs. Substantial Protection: What the Research Found

The familiar target of 150 minutes of moderate physical activity per week remains an important starting point for adults. However, research involving data from the UK Biobank, discussed in the British Journal of Sports Medicine (BJSM), found that this level was associated with only a modest reduction in cardiovascular risk—around 8–9%.

The interesting part was what happened at higher activity levels.

The research found that people completing roughly 560–610 minutes of activity per week were associated with a cardiovascular risk reduction of more than 30%. That works out to approximately 9 to 10 hours of activity each week.

This does not mean that everyone needs to exercise for 10 hours immediately. Nor does it mean that 150 minutes of exercise is not useful. Instead, the findings suggest that there may be a difference between doing enough to meet the basic guideline and doing substantially more to potentially gain greater protection.

It is also important to understand that this was observational research. It looked at patterns between activity levels and cardiovascular outcomes, so it cannot prove that a specific number of exercise minutes directly causes a specific percentage reduction in risk.

Still, the message is useful: more regular physical activity can offer benefits beyond simply meeting the minimum weekly target.

Why Your Fitness Level Changes Your Personal Target

There is no single exercise target that works exactly the same way for every person.

One important factor is cardiorespiratory fitness, often measured using a value called VO2 max. In simple terms, it reflects how well your body can use oxygen during physical activity and gives an idea of your aerobic fitness.

The research suggests that people starting with lower levels of fitness may need around 30–50 additional minutes of activity per week compared with highly fit individuals to achieve a similar level of benefit.

That may sound discouraging, but it should actually make exercise planning more personal.

You do not need to look at the 9-to-10-hour figure as a test that you must pass. Think of it as a direction to build towards, depending on your current fitness, health, lifestyle and ability.

For someone who currently spends most of the day sitting, moving from very little activity to 150 minutes a week is already a meaningful change. Once that becomes comfortable, gradually adding more movement can help you progress further.

Your goal should not be to compare your weekly exercise with someone else’s. The better question is: Where am I now, and what is the next realistic step for my heart health?

What Counts as Exercise, and How Can You Build Towards 10 Hours?

When we talk about the weekly activity numbers in this research, the focus is mainly on aerobic activity such as brisk walking, cycling and swimming.

Resistance or strength training is also valuable. It can support muscle strength and provide additional health benefits, including helping maintain a healthier cholesterol profile. However, strength sessions should be viewed as an important part of your overall fitness routine rather than simply adding them to the specific aerobic-minute count discussed in this research.

For a busy professional currently doing around 150 minutes a week, increasing activity does not have to mean spending every evening at the gym.

For example, you could build your week around:

Commute walks: Add a brisk 15–20-minute walk before or after work.
Lunch-break movement: Use part of your lunch break for a brisk walk instead of remaining at your desk.
Weekend activity: Add cycling, swimming, a long walk or a sport you enjoy.
Regular daily movement: Take the stairs, walk during short breaks and reduce long periods of sitting.
Two strength sessions: Keep separate strength workouts as part of your overall fitness plan.

And remember, you do not have to jump from 150 minutes to 600 minutes overnight.

If 20 minutes of cardio is what you can manage consistently right now, it is a useful starting point. The key is to build gradually as your fitness improves. A consistent increase over time is far more practical than attempting one very long workout and then struggling to repeat it.

Can Exercise Reverse Heart Age? And Is Most Heart Disease Preventable?

Two questions often come up when people start thinking seriously about exercise and heart health.

Can exercise reverse your heart age?

Regular physical activity can improve cardiovascular fitness and may improve several risk factors over time. However, saying that exercise will simply “reverse your heart age” would be too strong. Heart age is not a single, universally measured outcome, and the effect of exercise varies from person to person.

A better way to think about exercise is that consistent activity can help your cardiovascular system become fitter and can lower several important risk factors.

What about the claim that 90% of heart disease is preventable?

A large share of cardiovascular risk is linked to factors that can be changed or managed. These include physical activity, diet, smoking, blood pressure and blood sugar. This highlights how much our everyday choices can matter.

However, exercise is only one part of the picture. Genetics, age, existing medical conditions and other factors also influence cardiovascular risk.

So, rather than looking for one magic number or one habit that guarantees protection, focus on the combination of healthy choices that you can maintain for years.

Make Exercise Sustainable, Not Overwhelming

Hearing that greater heart protection may be linked with 9 or 10 hours of weekly activity can feel like a lot—especially if you already have a demanding job, family responsibilities and limited free time.

The goal is not to panic and overtrain.

The important takeaway is to understand where you are today and gradually move towards a higher level of regular activity when it is appropriate for you.

Simple tracking can help. You could use your phone to monitor steps, wear a fitness band or simply keep a weekly record of your exercise minutes. You do not need a complicated system. The purpose is simply to become more aware of your activity and identify opportunities to move more.

Start with what feels achievable. Build consistency. Then increase gradually.

And before significantly increasing your activity—particularly if you are over 35 and have spent years following a desk-based routine—it is worth knowing your baseline heart health. This can help you choose a safe and realistic target rather than simply guessing how much exercise your body can handle.

Take the Next Step with a Heart Health Check

If you are a working professional trying to become more active, knowing your starting point can make the process easier and safer.

A baseline heart health assessment, which may include blood pressure measurement, an ECG and an overall cardiovascular risk assessment, can help identify important factors before you significantly increase your activity level.

At Shri Krishnasai Clinic, Dr. Harikrishnan provides diagnostic and preventive cardiology services designed to support people who want to take a more informed approach to their heart health.

If you are ready to move beyond simply “meeting the minimum” and start working towards better long-term heart protection, a preventive heart health check-up can be a useful first step.

Book a preventive heart health check-up and understand where your heart health stands today.

Medical Disclaimer

This blog is intended for general awareness and educational purposes only and is based on published research findings. It is not a substitute for professional medical advice, diagnosis, or treatment. Individual exercise capacity and cardiovascular risk vary, especially for those with existing heart conditions, high blood pressure, or other health concerns. Please consult a cardiologist or physician before starting or significantly increasing an exercise routine, particularly if you are over 35 or have known risk factors.