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When you think of cardio, you may think of taking a long, brisk walk or heading out for a run. While many people’s view of cardio exercise may be limited, the truth is that it’s actually hard to define cardio due to its breadth and depth. In this comprehensive guide to cardio, we answer questions like: 

  • What is cardio? 
  • Why is it essential for physical and mental health
  • How does it differ from other exercises? 
  • Does HIIT count? 

Read on to learn the true definition of cardio and why it’s an essential part of everyone’s fitness and wellness routine. 

Cardio Exercise: Quick Overview

Cardiovascular refers to the heart (cardio) and the blood vessels (vascular) that help move blood through the body. Cardiovascular exercise is activity that raises the heart rate, putting you into your target heart rate zone for a given amount of time.

An image of a woman running on a NordicTrack X22i Treadmill

There are two types of cardiovascular exercise: aerobic exercise and anaerobic exercise. What many people call “cardio” is actually aerobic exercise.

Aerobic means “with oxygen.” This type of cardio exercise is performed for extended periods of time, allowing your body to use oxygen as fuel and energy. As you breathe, your heart pumps the oxygenated blood through your body and to the large muscle groups. 

Aerobic exercise is typically light- to moderate-intensity activity, like a 30-minute run or 45-minute bike ride. As you’re moving, your heart rate remains elevated, and your breathing may be a little heavy. But you should be able to continue a conversation, or at least respond in short sentences.

Anaerobic means “without oxygen” and is a high-intensity physical activity. Anaerobic exercise typically occurs in short, quick, and intense quick bursts, which makes breathing more difficult. In this vigorous-intensity exercise, the oxygen demand is higher than your body’s supply, so your muscles break down carbohydrates1 from blood glucose for fuel and energy.

If you’re familiar with high-intensity interval training, or HIIT workouts, that’s a textbook example of anaerobic exercise. HIIT workouts are broken into short intervals where you do quick bursts of vigorous activity. During this exercise, you may not be able to speak much, breathing is labored, and you can’t sustain the high-impact activity past the interval time. 

That isn’t to say that anaerobic activity can’t have a positive effect on your heart health. A meta-analysis1 in the World Journal of Cardiology points out that anaerobic exercise, even though it isn’t considered cardio, can still have a positive impact on your cardiovascular system.

It’s important to remember, too, that there can be some overlap between aerobic and anaerobic exercise. For example, an experienced runner who sets out on a tempo run will likely switch between energy systems, beginning in an aerobic state and converting to anaerobic metabolism once oxygen supply dips too low to support oxygen-based metabolism.

nordictrack rw700 rower in use

Types of Cardiovascular Exercise

Cardio exercise is not limited to just running or biking. Many activities can help you target large muscle groups, increase your heart rate, and add variety to your workout routine. Here are some ways to incorporate cardio into your routine using gym equipment or your body weight.

Equipment-Based Cardio Exercises

Utilizing equipment for your cardio exercise is a good option when the weather is bad, you want some modifications for a comfortable workout, or you like the idea of having programmed exercise. For example, on a treadmill, you can control your speed to enjoy a long walk, a light jog, or move into more vigorous activities like sprints and running with pre-programmed workouts. 

Some other example of equipment-based cardio include:

  • Using a rowing machine
  • Jumping rope
  • Riding on a stationary bike or outdoor bike 
  • Working out on a vertical climber
  • Using battle ropes
  • Skiing
  • Using an elliptical  

Related: Personal training apps

Bodyweight Cardio Exercises:

Using just your body weight for cardio can be enjoyable, easy, and affordable. Some examples of bodyweight cardio activities include:

  • Burpees
  • Mountain climbers
  • Zumba
  • Dancing
  • Running
  • Walking
  • Swimming
  • Jumping jacks
  • High knees

Many sports are also cardio workouts, such as tennis, soccer, football, and basketball. The American Heart Association2 has even encouraged doing active yard work and chores as a form of cardio. 

Key Benefits of Cardio Exercise

Cardio has been proven to help people live longer, stay active at any age, and feel better about themselves. Here are some key benefits of cardio:

nordictrack elite treadmill side view

Disease and Illness Prevention

The Centers for Disease Control and Prevention3 reports that heart disease is the No. 1 cause of death in the United States. That’s a scary fact! But cardiovascular exercise can reduce the risk of many diseases and illnesses, including heart disease. 

Regular cardio exercise can reduce your chances of having a stroke from clogged arteries. It can also lower your blood sugar intake and reduce the likelihood of developing type 2 diabetes4. The American Cancer Society5 states that cardio exercise lessens the risk of certain types of cancer as well. 

Studies also have shown that aerobic exercise may: 

Physical Health and Appearance

In 2020, the Mayo Clinic8 analyzed weight loss, metabolism, and its connection to burning calories. The study found that although we don’t have complete control over our metabolism or weight, cardiovascular exercise can alter how our bodies store energy. Researchers found that regular cardio exercise may help you maintain or lose weight in addition to combating obesity and, in some cases, speed up your metabolism. Remember, though, that genetics and other lifestyle factors also largely influence your metabolism and physique.

Long-Term Mobility and Strength

Cardio is one of the most natural ways to help you live a longer and healthier life. And being active at any age is essential because it increases your flexibility, muscle strength, balance, and bone density. The Mayo Clinic9 stresses the importance of moving your body to avoid or minimize the effects of joint pain, arthritis, and even osteoporosis. 

Mental Health and Brain Function

Cardio is almost like a cure-all. It improves your body functions from head to toe, including your mental health and quality of sleep.

coop on Bells of Steel Blitz Bike 2.0

Here are some of the mental health benefits10 you may gain from cardiovascular exercise:

  • Better cognitive function
  • Less likely to develop early Alzheimer’s or dementia 
  • Improves your mood and self-esteem
  • Has helped with depression
  • Having better sleep and less likely to have insomnia
  • Improves your memory, attention, and processing speeds
  • Can reduce anxiety
  • Improves quality of life and mental health

How Much Aerobic Exercise Do You Need?

The American Heart Association11 recommends doing 150 minutes of moderate to intense aerobic exercise weekly, or at least 75 minutes per week if you’re doing only vigorous cardio activities. You can choose how to split it up between the days and try to add in a rest or low-impact day.

We’d also be remiss if we didn’t mention that it’s important to prioritize regular stretching and strength training in your routine. Learn how to incorporate and structure your workouts with our cardio vs. strength training guide. 

Final Thoughts: What Is  Cardio?

When cardiovascular fitness is accessible, easy, and beneficial for your health, it’s hard to see a downside. Finding the cardio exercises you enjoy may help you:

  • Reduce the risk of long-term disease and illness
  • Extend the length of your life, health, wellness, and mobility
  • Maintain a more consistent and healthy weight
  • Improve your mental and physical wellbeing

FAQs: What Is Cardio?

What is meant by cardio exercise?

Cardio exercise refers to physical activity during which your heart rate is in your target heart rate zone for a certain amount of time. This can look like walking, running, cycling, swimming, jogging, dancing, and even ski machines and stair climbers. As long as your heart rate is in the recommended zone, your body is moving, and you utilize large muscle groups, you’re doing it!1

What are examples of cardio?

-Water aerobics
-A brisk walk
-Casual biking
-Stair climbing
-Chores around the house
-Hiking uphill
-Running or sprinting
-Doing heavy amounts of yard work
-Jumping rope, jumping jacks, squat jumps, planks, V- ups
-Biking at least 10 miles per hour
-HIIT workouts

What is the best cardio exercise?

Any cardio exercises listed in this guide are great options for cardiovascular health, especially when you’re meeting the 75- to 150-minute mark each week. If you prefer working out hard and for less time, anaerobic exercise will be your better option.


  1. Patel H, Alkhawam H, Madanieh R, Shah N, Kosmas CE, Vittorio TJ. Aerobic vs. anaerobic exercise training effects on the cardiovascular system. World J Cardiol. 2017;9(2):134-138. doi: 10.4330/wjc.v9.i2.134
  2. American Heart Association editorial staff. American Heart Association Recommendations for Physical Activity in Adults and Kids. [Updated April 18, 2018]. In: American Heart Association [Internet]. 2023 October. 
  3. CDC editorial staff. Heart disease facts. [Updated July 15, 2023]. In: Centers for Disease Control and Prevention [Internet]. 2023 October. 
  4. Colberg SR, Sigal RJ, Fernhall B, Regensteiner JG, Blissmer BJ, Rubin RR, Chasan-Taber L, Albright AL, Braun B; American College of Sports Medicine; American Diabetes Association. Exercise and type 2 diabetes: the American College of Sports Medicine and the American Diabetes Association: joint position statement. Diabetes Care. 2010 Dec;33(12):e147-67. doi: 10.2337/dc10-9990. PMID: 21115758; PMCID: PMC2992225.
  5. American Cancer Society. How exercise can lower cancer risk. February 2020.
  6. Rawashdeh A, Alnawaiseh N. The Effect of High-Intensity Aerobic Exercise on the Pulmonary Function Among Inactive Male Individuals. Biomed Pharmacol J 2018;11(2).
  7. Chastin, S.F.M., Abaraogu, U., Bourgois, J.G. et al. Effects of Regular Physical Activity on the Immune System, Vaccination and Risk of Community-Acquired Infectious Disease in the General Population: Systematic Review and Meta-Analysis. Sports Med 51, 1673–1686 (2021). https://doi.org/10.1007/s40279-021-01466-1
  8. Mayo Clinic. Metabolism and weight loss: How you burn calories. [Updated Nov. 10, 2020]. In: Mayo Foundation for Medical Education and Research [Internet]. 2023 October. 
  9. Mayo Clinic. 10 great reasons to love aerobic exercise. [Updated February 17, 2023]. In: Mayo Foundation for Medical Education and Research [Internet]. 2023 October. 
  10. Jan Knapen, Davy Vancampfort, Yves Moriën & Yannick Marchal (2015) Exercise therapy improves both mental and physical health in patients with major depression, Disability and Rehabilitation, 37:16, 1490-1495, DOI: 10.3109/09638288.2014.972579
  11. American Heart Association. American Heart Association Recommendations for Physical Activity in Adults and Kids. Last reviewed April 2018

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