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Want to increase your stamina? Work on your cardiorespiratory fitness and endurance!

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Want to increase your stamina? Work on your cardiorespiratory fitness and endurance!

Cardiorespiratory fitness refers to how well your body does while performing a physical task. A healthy diet, weight control and interval training are great ways to improve this.

An increase in stamina, low chances of heart disease and control over high blood pressure are all benefits of cardiorespiratory fitness. Cardiorespiratory fitness, also known as cardiorespiratory endurance, cardiovascular fitness, and cardiovascular endurance, improves oxygen levels in the lungs and heart when we are doing anything that involves physical exertion.

Cardiorespiratory fitness refers to how well your body can perform when you are exercising. If your cardiorespiratory fitness is on point, you can endure long, physical exercise without getting tired. Read on to learn more about cardiorespiratory fitness, the exercises that can help you improve it, as well as the risks involved.

What is cardiorespiratory fitness?

Cardiorespiratory fitness (CRF) refers to the ability of the cardiovascular and respiratory systems to deliver oxygen during prolonged physical activities. “It is an important sign for overall health and heart function,” explains cardiologist Dr Chirag D.

According to research published in Nutrition in the Prevention and Treatment of Abdominal Obesity, cardiorespiratory fitness can be determined by gender, age and genetics, as well as, the relationship between your health and physical activity. Strong CRF allows you to perform daily activities with more ease, reducing fatigue during tasks like climbing stairs or carrying groceries. It also helps you recover faster from exercise, allowing you to get back to your workout routine sooner.

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What are the various endurance tests for cardiorespiratory fitness?

Your cardiorespiratory fitness can be measured through some tests.

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The Treadmill Stress Test
is when a patient is hooked on to electrodes to measure his heart function while doing an exercise. Image courtesy: Freepik

1. VO2 Max Test

This test measures the maximal uptake of oxygen in a high-intensity exercise. In this exercise, you get on a treadmill or a bike and increase your intensity every few minutes, until you are exhausted. This method is touted to be the most accurate one, states this research, published by the University of Virginia.

2. 6-Minute Walk Test

This test evaluates sub-maximally distance covered within six minutes. This test is low risk and is useful in assessing adults who have love cardiorespiratory fitness, states this study, published in Pulmonology.

3. Treadmill Stress Test

This test monitors heart rate during increasing intensity levels on a treadmill. This test is usually done in a lab, where electrodes are put on the patient’s chest, and these are then connected to an ECG machine. This makes a record of all heart activity, including blood pressure and heart rate, states this study, published by the National Institute of Health.

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What are the causes of low cardiorespiratory fitness?

Various causes are associated with low respiratory fitness levels. Some of these are as follows:

  • Sedentary lifestyle: No regular exercise and sedentary desk jobs can lead to cardiorespiratory fitness levels dropping. No exercise often leads to fatty material in your arteries. This can cause serious problems, including a heart attack. Exercise is beneficial for cardiovascular health, states this study, published in Frontiers in Cardiovascular Medicine.
  • Chronic diseases: Illnesses like heart attack, diabetic condition, and lung problems can also lead to a drop in cardiorespiratory fitness. This disease can also cause pain and fatigue.
  • Obesity: The burden of excessive body weight on the heart and lungs can lower cardiorespiratory fitness levels. It may also lead to cardiovascular diseases and needs to be worked on at once, reports a study, published in the Journal of Obesity.
  •  Aging: Gradual deterioration of body strength and muscle mass over time. A study, published in the Archives of Internal Medicine, states that cardiorespiratory fitness levels decrease with age.

How can you improve your cardiorespiratory fitness?

There are various ways to work on your cardiorespiratory fitness levels. Here are a few ideas that you can try out.

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1. Regular aerobic exercise

Regular exercise such as walking, running, and cycling improves the performance of both the heart and lungs. A study, published in Research Quarterly for Exercise and Sport, states that adults should do 150 minutes of moderate-intensity or 60 minutes of vigorous-intensity physical activity per week, as recommended by the American College of Sports Medicine (ACSM) and the American Heart Association (AHA).

2. Interval training

Endurance can be enhanced through fluctuating intensities between highs and lows. High-intensity interval training is a form of exercise where you have short periods of intense and explosive movements, followed by low-intensity exercise or even rest. This helps control obesity and increase cardiorespiratory fitness levels, states this study, published in Frontiers in Public Health.

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3. Healthy diet

Nutrient-rich foods support overall physical health and energy levels. A study, published in Nutrients, observed the impact of a healthy diet on a group of Korean adults from 19-64 years. The VO2 Max test was used to determine the cardiorespiratory fitness levels. It was seen that adults, in the age group of 19-34 years, reported high CRF levels.

4. Consistency

Regular, sustained effort is crucial for long-term improvements. Make sure that you continue to do the above-mentioned things regularly to see a change.

Cardiorespiratory fitness can be improved by regular exercise. Image courtesy: Freepik

Cardiorespiratory activities

You can try some cardio-respiratory activities that help elevate your breathing and heart rate for an extended period of time, suggests fitness expert and Fit India Ambassador Wanitha Ashok.

  • Brisk walking
  • Running
  • Jogging
  • Cycling
  • Swimming
  • Aerobics
  • Dance
  • Zumba
  • Jumping rope
  • Stair climbing
  • Treadmill
  • Stationary cycling
  • Cross trainer
  • Circuit training
  • High-intensity interval training (HIIT)
  • Kickboxing

What to keep in mind while doing CRF exercises?

Make sure to keep these things in mind when you practice cardiorespiratory fitness:

  • One should start slow and gradually build the workout in terms of duration and intensity.
  • You should not push yourself and listen to your body.
  • Hydration before, during and after the cardio respiratory exercises is advised to replace the list water in the form of sweat and to prevent giddiness and nausea.
  • It’s not advisable to do cardio respiratory exercises in the hot Sun, the best time to workout is early morning or evenings. In cold temperatures it’s advisable to be dressed in layers.

What are the risk factors related to cardiorespiratory fitness?

Low cardiorespiratory fitness, linked to an inactive lifestyle, weakens your body’s ability to use oxygen during exercise. Age, genetics, and certain medical conditions can also contribute. Additionally, high lipid values, high blood pressure, higher heart rates, higher waist circumference and higher body fat percentages can affect cardiorespiratory fitness levels, states this study, published in Scientific Reports.

Regular physical activity is key to improving your CRF. Even small increases in activity can significantly benefit your heart, lungs, and overall health.

 

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Fitness

Enter 2026 stronger than ever with these expert-approved fitness tips

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Enter 2026 stronger than ever with these expert-approved fitness tips
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Whether you’re focused on building muscle, improving your balance or working on your ability to complete longer, sustained workouts, one thing’s for sure: you’ll need to take small, actionable steps to reach your fitness goals.

Remember, you don’t need to drastically overhaul your life on January 1. In fact, before making any major changes to your dietary pattern and exercise routine, it’s best to have a conversation with your doctor first, especially if you live with any chronic conditions. In the long run, you’ll most benefit from taking small, actionable steps to help achieve your fitness and nutrition goals, the experts say.

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We asked fitness experts to break down their top tips to help you kick off 2026 stronger than ever.

How to fit exercise into a busy schedule

If you’re hitting the reset button on your fitness routine, start small and choose an exercise you enjoy, says Dr. Kimberly Burbank, a primary care sports medicine fellow and team physician at UCLA Athletics. You don’t necessarily need to do the movements traditionally associated with exercise to get a good workout in, either. “I really encourage people to choose (a movement) they actually enjoy doing, because they will probably stick with it more,” she says.

To help set attainable fitness goals, one route is to use the SMART framework of goal setting, recommends Dr. Brandee L. Waite, a professor and vice chair of Wellness & Community Engagement Department of Physical Medicine & Rehabilitation at UC Davis School of Medicine, the medical director of the UC Davis Health Sports Medicine Clinic and the director of Lifestyle & Longevity Medicine Innovation.

The SMART acronym stands for goals that are specific, measurable, attainable, realistic and time bound, and what’s great about using this framework in an exercise context is that you’re able to approach fitness as you would any other appointment — if it’s scheduled on your calendar, there’s a greater likelihood you’ll honor it, Waite says.

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When it comes to fitting exercise into a busy schedule, “I try to encourage consistency over perfection,” Burbank says. Often, her patients will express frustration that they’ve missed a week of exercise — and therefore their entire workout schedule has been thrown off. While it’s important to “be as consistent as you can, (understand) that you don’t have to be perfect to still make a meaningful difference,” she says.

If you’re someone who prefers to exercise in the morning, try to make it easy for yourself when you wake up. “It’s so easy when that alarm goes off to just ignore it and move on. But if you have laid out your clothes the night before, have your coffee prepped (and) have your bag packed, then there’s so many (fewer) variables and barriers,” Burbank says.

How often should you exercise?

There’s no perfect cadence as to how often you should exercise. “What works really well for one person, will not work at all for another person. So, it does need to be personalized and realistic,” says Waite. However, there is something to be said about shorter, more frequent workouts. There’s a lower risk of injury, and they’re faster to complete and generally easier to stay consistent with, Burbank says.

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Ultimately, what’s most important is to meet a certain number of goal minutes every week, says Dr. Julia L. Iafrate, a sports medicine physician at NYU Langone Health and a team physician for the U.S. Ski Team. The Physical Activity Guidelines for Americans and the American College of Sports Medicine recommend adults participate in 150-to-300 minutes of moderate-intensity exercise a week. While this might sound intimidating, that breaks down to only 30 minutes of exercise a day over the course of five days, and could consist of a mix of pilates, yoga or brisk walking.

If you prefer vigorous-intensity aerobic exercises (like HIIT or running), it’s recommended you complete at least 75 minutes a week, which evens out to a little more than 20 minutes of exercise a day over the course of three days. On top of these exercises, the organizations suggest adults should partake in muscle-strengthening workouts at least two days a week.

What are the most beginner-friendly exercises?

There are a few forms of exercise that should be a central focus of your workouts: cardio, muscle strengthening and balance work. Practicing each type of exercise can help improve your ability to do the others and also reduce your risk of injury, Iafrate says.

  • Cardio. Incorporating aerobic exercises that get your heart rate up (such as running, swimming or cycling) is key to improving endurance, supports heart and lung health, and lowers your risk for a number of chronic diseases, Iafrate says. 
  • Muscle strengthening. Resistance training with weights stimulates two types of muscle contractions: eccentric loading and concentric loading. When you perform a bicep curl with a dumbbell in hand, that’s considered a concentric motion. As you lower the dumbbell and your arm straightens, that is an eccentric motion, Iafrate says. Both movements are important for strength building, tendon health and bone mineral density, she explains. 
  • Balance work. Functional movement training, including tai chi and yoga, is especially beneficial for maintaining flexibility, stabilizing your body and limiting the likelihood of falls down the line, Iafrate says. 
  • Weight-bearing exercise. “Walking, especially for beginners, is super underrated,” Burbank says. Getting your step count up to 7,000 steps a day offers immense benefits for health, including lowering your risk for cardiovascular diseases and type 2 diabetes, according to a 2025 study published in Lancet Public Health.

If you’re relatively new to exercise and don’t know what is helpful or harmful, Waite recommends having at least two-to-three sessions with a physical therapist to develop the right type of exercise program. For instance, if someone has a medical condition like hip arthritis, a professional can provide “modifications for a regular fitness training program that won’t further exacerbate the problem that is currently bothering them,” Waite says.

How can nutrition support fitness goals? 

“Nutrition and exercise have such a symbiotic relationship,” Burbank says. Throughout your week, prioritize whole, fiber-rich foods, including fruits, vegetables and whole grains. Americans aren’t consuming nearly enough protein, which is essential to muscle building, muscle recovery and satiety, Burbank notes. Your minimum daily intake of protein should hover between 0.8 grams to 1.2 grams of protein per kilogram of body weight. To increase your protein intake, the Dietary Guidelines for Americans 2020-2025 recommends incorporating more lean meats, poultry, eggs, seafood, legumes, nuts, seeds and soy into your diet.

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Hydration is particularly important, especially prior to working out. “When you’re dehydrated, (it will) increase your likelihood for fatigue and poor peak performance,” Iafrate says. Ideally, we should be drinking between 2.5 to 3 liters of water a day, Burbank says. 

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New Year’s Fitness Goals: Avoid These Common Mistakes

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New Year’s Fitness Goals: Avoid These Common Mistakes

A new year usually brings new fitness goals, fueling spikes in gym memberships and social media feeds filled with workout selfies. Yet, just as quickly as this wave of motivation appears, it usually recedes.

Why does this cycle repeat itself year after year? Well-meaning individuals often start with intense, all-or-nothing approaches that are difficult to sustain, fitness experts say. Life gets in the way, motivation wanes, and the pressure to see immediate results leads to burnout.

A commitment to fitness is a common challenge, and finding a solution is crucial for long-term success, according to Steven Hale, M.D., a primary care sports medicine physician with Baptist Health Orthopedic Care. To get expert advice on this topic, award-winning journalist Johanna Gomez hosted a new Baptist Healthtalk podcast featuring Dr. Hale.

He emphasizes that the most effective plan is one that fits into one’s life seamlessly.

“If it’s in your schedule every day, then you’re going to have to do something active,” Dr. Hale explains. “Whether that’s mobility, maybe you only have 20 or 15 minutes to stretch. Maybe you have an hour this one day because you got off work early. Now you can do some more strength training and maybe some increased cardio.”

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This approach shifts the focus from overwhelming daily workouts to simply incorporating movement into your daily schedule. Building on this foundation of practical advice, Dr. Hale answered some of the most common questions about starting a new fitness routine.

I haven’t worked out in a long time. What’s a good way to start without getting overwhelmed or injured?

Dr. Hale: It really depends on your previous activity level and experience with exercise. Someone who was a college athlete or has a lot of experience can probably go back to the gym, start with lighter weights, and build from there. For someone who is less experienced or doesn’t enjoy the gym environment, I often recommend starting at home. You can look up fun follow-along exercise videos on platforms like YouTube.

Classes can also be a great option for those new to exercise, as they provide guidance from instructors. Personal trainers are another fantastic resource if they fit your budget. The key is to start slow to minimize your risk of injury. Don’t go too hard in the beginning. The first few workouts might not feel great as you get back in shape, so making it fun and enjoyable will help you stick with it longer.

Diet and exercise are both important, but which one should I focus on more if I want to see results?

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Dr. Hale: As a doctor, I have to say they go hand-in-hand; I can’t recommend one without the other. Diet is just as important, if not more important, than exercise when it comes to seeing results quickly. In the short term, diet probably has a slight edge. We often talk about creating a calorie deficit for weight loss, which means the calories you consume should be less than the calories you burn.

It’s much easier to consume calories than it is to burn them. A single high-calorie meal can easily undo the effort of an hour-long workout. However, for long-term health, diet and exercise are equally important. What you put into your body for nutrients is just as vital as staying active. Instead of overhauling your entire diet at once, which is hard to stick to, try making one small, manageable change each week. For example, cut out one specific snack food or fast-food meal. This slow progression helps you build sustainable habits.

How do I know the difference between normal muscle soreness and an actual injury?

Dr. Hale: It’s a great question because many people enjoy the feeling of being sore after a good workout — it’s like a victory. Soreness is typically a dull ache that you feel after exercise, and it usually goes away within a few days. Pain that should concern you is more severe. On a pain scale of one to ten, anything greater than a three is something to pay attention to.

Concerning pain might also be sharp, or you might have felt a ‘popping’ sensation during your workout. Other warning signs include mechanical symptoms like a joint feeling unstable or locking up. These are more serious symptoms that indicate you should probably see an orthopedic specialist. It’s important to listen to your body and not push through sharp or worsening pain.

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The phrase “no pain, no gain” is very popular. Is it true that I need to push through pain to make progress?

Dr. Hale: That is one of the first myths I address in my practice. The “no pain, no gain” philosophy is not a good approach for orthopedic health. If you feel pain, it’s a sign that there is inflammation in that area. Pushing through that pain will only worsen the inflammation and delay your recovery.

Instead of pushing through it, pain is a signal from your body to rest or modify your activities. Give the affected area time to heal and for the inflammation to calm down before you return to that specific exercise. If you continue to push through pain, you risk causing the issue to last longer or become more severe. You can likely push through discomfort that is less than a three out of ten on the pain scale, but anything more than that requires attention.

I want to stay consistent, but I’ve heard working out every day is bad. How often should I be exercising?

Dr. Hale: This depends on how you define ‘workout.’ If you’re doing intense strength training where you are really stressing your muscles, those muscles need time to recover. Overtraining can lead to inflammation, pain, and a higher risk of injury. In that case, you need to build recovery days into your schedule.

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However, you can and should do something active every day. I recommend having something in your schedule daily because it makes it harder to use excuses and push it off. We can think of these as ‘mobility days’ versus ‘strength days.’ A mobility day could be stretching, yoga, or going for a walk. A strength day involves more intense activity like lifting weights or jogging. For example, a good plan could be three or four strength training days per week with active recovery like walking on the other days. This way, you are moving your body every day while still giving your muscles time to recover. Any activity is beneficial.

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Here’s how strong your grip should be in each decade of your life

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Here’s how strong your grip should be in each decade of your life

I recently took a longevity fitness test, an element of which included a grip strength assessment with a hand dynamometer. Research links grip strength to longevity, as it is considered a good indicator of overall physical strength and risk of frailty, as well as neuromuscular function (or the connection between brain and muscle).

How is grip strength linked to longevity?

“Handgrip strength is measured with a handheld dynamometer as the peak force produced by a maximal isometric contraction of the forearm muscles. From research, it is proven to give a quick, reliable snapshot of global muscle strength and is considered a biomarker for physiological reserve, rather than just hand function,” explains Athanasios Tzoumaris, strength and conditioning coach at London-based gym and health clinic Hooke Fitness, where I took my test.

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