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What Is Cardio Training?

You know you should do it. You know it can be a boon to health. You know it involves sweating. But beyond that — what is cardio exercise exactly? How does it affect the body differently from other forms of exercise? What counts as cardio training and what doesn’t? How often should you do it, and how should you do it? We have the answers below.


What Is Cardio Training?

“People tend to think of cardio in terms of steady state exercise, like jogging,” says Trevor Thieme, C.S.C.S. and Openfit’s senior manager of fitness and nutrition content. “But really, cardio is anything that A) raises your heart and breathing rates, and B) improves the function of your heart, lungs, and circulatory system.”

To bring more clarity to this type of exercise, let’s tackle a few common cardio training misconceptions one at a time:


Myth: Cardio is any exercise that increases the heart rate

Not quite. Just about any physical activity you do can increase your heart rate, from lifting weights to strolling between your desk and the bathroom to rolling out of bed in the morning. For an activity to qualify as a cardio workout, it has to meet both criteria mentioned above. In short, it has to raise your heart and breathing rates, and challenge your cardiovascular system, just like a biceps exercise has to challenge your biceps and an abdominal exercise has to challenge your abs.

While leisurely activities like walking and easy bike riding have benefits of their own, and are cardiovascular in nature, they aren’t cardio exercises (unless you are very de-conditioned). That’s because they don’t challenge the heart and lungs enough to improve their function.


Myth: Cardio is the same thing as ‘aerobic exercise’

Aerobic exercise is one form of cardio training — but it’s not the only one.

Think of your body as a hybrid vehicle with two engines: one is aerobic — meaning it requires oxygen to run, while the other is anaerobic — meaning it doesn’t need oxygen. Both engines are always active, but depending on the duration and intensity of your workout, one will work harder than the other.

The aerobic system is best for long and relatively easy activities — the stuff you spend most of your day doing: working at a desk, eating, walking — and for lower-intensity forms of exercise, like jogging. You can emphasize the aerobic system with continuous low-intensity activity lasting 20 minutes or more.

The anaerobic engine is for fast and intense activities, like squatting a barbell or sprinting all-out for 30 seconds. It’s also emphasized during repeated bursts of intense activity, such as cardio workouts involving high intensity interval training (HIIT).

Mountains of research in the last two decades (including this study) show that both aerobic and anaerobic workouts can improve cardiovascular function — and so both approaches qualify as “cardio” exercise.


Myth: You have to track your heart rate to get a good cardio workout

Since cardiovascular exercise is directly related to how hard your heart is working, that must mean you need to know your heart rate with some fancy heart rate monitor, right?

Not exactly. While trainers have traditionally used the “age adjusted heart rate” formula (check it out here) to track intensity during cardio workouts, it’s been called into question in recent years: a 2010 study, for example, found that the age-based formula might not be accurate for many women. Other studies on different age populations have come to a similar conclusion.

Thankfully, there may be more accurate and practical way to monitor how hard your heart is working. Just use the talk test: if you find it difficult to speak, even in short sentences, then that likely means you’re in the right range for the activity to qualify as cardio exercise.


Myth: You have to run, bike, or swim, or else it’s not cardio training.

When it comes to cardio training, it’s not what you do — it’s how you do it.

“The umbrella of cardio encompasses much more than a long run,” Thieme says. “It also includes HIIT workouts, dancing, and some types of strength training (like circuit training). Even vigorous household activities count (like raking leaves, moving furniture, or carrying groceries up stairs) if you do them with enough commitment and intensity.” To determine if your chosen activity counts, just try out the talk test mentioned above.


Cardio Exercise Examples


Examples of Cardio Exercises

Sure, standard workouts like running, cycling, and stair climbing can be great cardio exercises, but so can kickboxing, shooting hoops, and shoveling snow. Your cardio training options are almost limitless. You just need to keep the intensity high enough to challenge your heart and lungs.

Cardio training can be a steady-state exercise that’s done at low to moderate intensity, like jogging or an easy bike ride. Cardio training can also be intervals of high intensity exercise, like HIIT, where you go all out for 20-120 second bursts, and then rest just long enough to allow you to perform the next round with equal intensity (like tabata).

Just keep in mind that whatever cardio activity you choose should involve large muscle groups in the legs and trunk, since smaller muscle groups like the biceps and calves don’t create an oxygen demand large enough to tax the cardiovascular system on their own.


Benefits of Cardio Training

What is cardio training good for, and why should you bother doing it? Like brushing your teeth and sleeping for seven to eight hours a night, it’s one of the most indisputably healthy activities you can do.

By challenging and strengthening your cardiovascular system, you increase its capacity to take in oxygen, pump blood to the working muscles, and clear carbon dioxide and other waste products from your system. Plus, as your heart becomes more efficient at pumping blood, your resting heart rate slows, reducing the stress on your most vital muscle.

Long story short: cardio training helps your heart and lungs function better both during exercise and at rest.


How to Pick the Best Cardio Workout For You

A recent study in the Journal of Physiology found that four to five cardio workouts a week is optimal for cardiovascular health and longevity. Over a lifetime, that’s a lot of time in the cardio saddle. So how should you spend it?

Since cardio exercise can encompass a vast range of activities — from stationary cycling to dancing to raking leaves — you have many options from which to choose, and you should choose several. After all, you don’t have to confine cardio training to workouts — you can weave it into your everyday life as well. Use these four factors to help you choose which type of cardio training is best for you.

  1. Convenience. Whatever type of cardio training you choose to do regularly, make it something that’s convenient. In other words, don’t commit to swimming workouts if you don’t have easy access to a pool, or cycling workouts if you don’t have easy access to clear roads or a bike path (or a spin bike). Ideally, you should choose something you can do close to home that involves minimal preparation and equipment. You can even do cardio at home!
  2. Preference. The Internet is overflowing with advice on what the best type of cardio training is, but ultimately, the best cardio workout is the one you’ll do consistently. So don’t take up mountain biking if you’re not into adrenaline sports; don’t choose swimming if you hate the water. Pick something you’ll be excited to do. Maybe you’re interested in doing something that’s martial arts-inspired, or a dance workout. Or maybe, some days you just want to just lace up your shoes, blast your workout playlist, and go for a run. Since cardio encompasses so many activities, don’t limit yourself to something you have to force yourself to do.
  3. Physical limitations. If you have a history of joint injuries, particularly to your knees, ankles, and lower back, you should avoid high-impact activities (like running and basketball). Instead, you should stick with low-impact cardio activities like cycling, swimming, and strength training. If you’re looking for a low-impact cardio workout at home, try something like yoga or pilates to boost your heart rate and get you sweating without any jumping or pounding on your joints.
  4. Time. Some people live for a four-hour weekend bike ride. Others would rather get it done fast and get out. Luckily, cardio training can be done in less than 30 minutes. Skeptical? You can get a sweat-inducing cardio workouts in 20 to 30 minutes with the right kind of HIIT workout. Whatever you choose, just be sure that it fits your schedule.


Openfit Cardio Workouts You Can Do at Home

If you’re ready to turn all of your newly acquired cardio training knowledge into cardio training experience, choose from the dozens of workouts on Openfit.

Tough Mudder T-MINUS 30

Tough Mudder T-MINUS 30 Hunter McIntyre cardio training

Four-time Tough Mudder X champion Hunter McIntyre helps you get into crazy shape in just 30 days of hard-charging, heart-challenging workouts that focus on building total-body strength, cardio endurance, and functional mobility. Whether you’re trying to conquer a Tough Mudder or just quantum-leap your fitness, T-MINUS 30 can help you get into the best shape of your life.


600 Secs

600 Secs Devin Wiggins

If you have 10 minutes, you have enough time to get an effective cardio workout. Trainer Devin Wiggins wrings out every last one of those 600 seconds with high-intensity workouts that maximize your fat burning and muscle building potential. Two or more workouts can also be stacked to create a longer, even more effective training session.


Xtend Barre

Xtend Barre Andrea Rogers cardio training

These 30-minute versions of Andrea Rogers’ signature studio class combine Pilates, ballet fundamentals, and high-energy cardio to help burn fat and sculpt a more muscular physique. Xtend Barre incorporates the isometric exercises of traditional barre workouts with dynamic, full range-of-motion movements that keep it fun, fresh, and challenging.


Rough Around the Edges (Coming Soon)

Rough Around the Edges Anisha Gibbs cardio training

This intense, results-driven training program is led by a team of professional stuntwomen, who teach you the actual moves they do to get ready for their roles. The result is a series of challenging, unconventional workouts — like Dance Fight MMA, Action Star Cardio, Booty Building Boxing, and Firecracker Weighted Core — designed to burn fat and build strength.

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