That’s because the body requires energy to recover from exercise. “The greater the intensity and volume, the more calories will be burned after the exercise is completed,” explains Iain Hunter, a professor of exercise sciences at Brigham Young University. When exercising, you burn some of your stored fuels; replenishing those stores takes energy. Your body uses energy to repair any microdamage from exercise as well. Plus, “along with caloric expenditure, there are many other benefits to higher intensity exercise, such as increased bone density, improved strength and endurance, more resilient cartilage and other tissues that degrade over time, and psychological health.”
4. It eases joint pain. Several studies have found that walking reduces arthritis-related pain, and that walking five to six miles a week can even prevent arthritis from forming in the first place. Walking protects the joints — especially the knees and hips, which are most susceptible to osteoarthritis — by lubricating them and strengthening the muscles that support them.
So how many calories are you really torching? “For an average height woman of 130 pounds walking at a typical speed of 2.9 miles per hour, the total energy expended to walk one mile would be 81 kilocalories (kilocalories is the proper name for what most people refer to as calories),” says study co-author Peter Weyand, Ph.D., a biomechanics professor and director of the Locomotor Performance Laboratory at Southern Methodist University. To compare: The old equation predicts you'll burn just 68 calories per mile at 2.9 miles per hour, says Weyand. “For a faster walk of four miles per hour or so, the number of kcals burned increases to about 95 per mile,” he says. 

3. It reduces the risk of developing breast cancer. Researchers already know that any kind of physical activity blunts the risk of breast cancer. But an American Cancer Society study that zeroed in on walking found that women who walked seven or more hours a week had a 14% lower risk of breast cancer than those who walked three hours or fewer per week. And walking provided this protection even for the women with breast cancer risk factors, such as being overweight or using supplemental hormones.
A pound of fat equals 3,500 calories. To lose one pound a week, you will need to burn about 500 more calories per day than you eat. You can do this by increasing your calorie-burning activity or by eating fewer calories—or both. It is easier to achieve it with combining increased activity and eating less. Exercising enough each day to burn 300 to 400 calories is a good goal for the exercise portion of your weight loss plan. 

Multi-tasking like this allows me to easily justify the time investment. Walking actually burns the same amount of calories as running… it just takes longer. However, I also do some form of "exercise" every day. This includes strength training twice a week, HIIT twice a week with weights or on an elliptical machine, and a light 10-minute workout three times a week on recovery days.

In the end, vigorous running wins out for calorie burn, but remember that calories aren't everything. Obsessing over exactly how many calories you consume or burn is just as unhealthy as not exercising at all. So choose the activity you love most—whether it be walking or running—and focus less on the calories and more on how much better you feel after doing it.

This is a good aerobic workout that also boosts upper body strength — and helps you let off steam. Boxing classes are widely available in many gyms. Some classes involve sparring with a partner — you take it in turns to hold a pad or pads while the other person punches them while wearing boxing mitts. Others involve no mitts or pads, just air punching and other moves that simulate boxing training. You can also use a punching bag either at the gym or in your own home.
Walking is a low-cost and effective form of exercise. However, the wrong type of shoe or walking action can cause foot or shin pain, blisters and injuries to soft tissue. Make sure your shoes are comfortable, with appropriate heel and arch supports. Take light, easy steps and make sure your heel touches down before your toes. Whenever possible, walk on grass rather than concrete to help absorb the impact.
Regardless of how many calories you burn, adding walking into your daily routine can have profound health benefits! Going on regular, brisk walks can help you maintain a healthy body weight and stave off diseases like diabetes, heart disease, high cholesterol and hypertension. In addition, regular walking helps improve bone density and leads to increased muscle strength.
Another American study found that people who walked for at least four hours a week gained less weight (an average nine pounds less) than couch potatoes as they got older. Last year, researchers at the University of Colorado found that regular walking helped to prevent peripheral artery disease (which impairs blood flow in the legs and causes leg pain in one-fifth of elderly people).
Walking might not have the same visual appeal as high-intensity interval training or step aerobics, but this simple exercise can be an efficient way to burn calories. Whether you're anxious to shed a few pounds or are just keen to avoid the middle-age spread, walking several times per week (in combination with a healthy diet, of course) can burn thousands of calories to help keep the excess pounds at bay. Consult your doctor before beginning any exercise regimen, even a light one.

Aerobic exercise is any physical activity that makes you sweat, causes you to breathe harder, and gets your heart beating faster than at rest. It strengthens your heart and lungs and trains your cardiovascular system to manage and deliver oxygen more quickly and efficiently throughout your body. Aerobic exercise uses your large muscle groups, is rhythmic in nature, and can be maintained continuously for at least 10 minutes.
Aerobic exercise involves regular body part (e.g., arms or legs) movements that increase workload on the cardiovascular system. It is convenient and useful to think of the intensity of aerobic exercises in metabolic equivalents, or METs. One MET represents the amount of energy used at rest, and two METs is twice that much energy expenditure per unit of time, and so on. Aerobic exercise is widely recommended in contemporary guidelines. However, guidelines also indicate that exercise regimens are contraindicated in patients with unstable cardiovascular conditions, including but not limited to uncontrolled severe hypertension (BP ≥ 180/110 mm Hg). Conditions under which stress testing should be performed before initiation of an exercise regimen have been described.37
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The statistics are impressive: The American Diabetes Association says walking lowers your blood sugar levels and your overall risk for diabetes. Researchers at the University of Boulder Colorado and the University of Tennessee found that regular walking lowered blood pressure by as much as 11 points and may reduce the risk of stroke by 20% to 40%. One of the most cited studies on walking and health, published in the New England Journal of Medicine in 2002, found that those who walked enough to meet physical activity guidelines (30 or more minutes of moderate activity on 5 or more days per week) had a 30% lower risk of cardiovascular disease, compared with those who did not walk regularly. "The physical benefits of walking are well documented," says Scott Danberg, director of fitness at Pritikin Longevity Center + Spa in Miami. With impressive results like these, there's a good chance you'll get a pat on the back from your doc at your next checkup. 

What is aerobic exercise?‘Aerobic’ exercise refers to exercise that requires the consumption of substantially more oxygen than at rest. It involves repeated rhythmic movements of the large muscles of your body, such as those in your arms or legs.Examples of aerobic exercise includebrisk walking;jogging;swimming;cycling;dancing;cross-country skiing;ice-skating;kayaking;roller-blading; andaerobic dance (often simply called aerobics).Because you need more oxygen to do aerobic exercise, you breathe more rapidly and deeply to get extra oxygen into your lungs. Your heart also beats faster to deliver more oxygen-carrying blood from your lungs to your muscles.How fast your heart beats and how rapidly you breathe will depend on how intense (hard) the exercise is, with gentle exercise causing only slight increases in breathing and heart rate, but more vigorous exercise resulting in greater increases.Aerobic versus anaerobic exerciseThe term ‘aerobic exercise’ comes from the fact that the energy used during this form of exercise is linked to the consumption of oxygen (aerobic metabolism). Aerobic exercise is of a light to moderate intensity, and is characterised by our ability to maintain it for a prolonged duration (many minutes to several hours).Very strenuous exercise, such as running fast or rapidly cycling uphill uses energy at a very fast rate, and will exceed our muscles’ capacity to work aerobically. Exercise at these higher intensities does involve the use of oxygen, but also requires your muscles to undertake some additional metabolism without oxygen (anaerobic metabolism). This anaerobic metabolism results in the production of fatiguing factors that cause you to have to slow down and eventually stop. The length of time before this occurs will depend on how much anaerobic metabolism is involved, with higher exercise intensities that require greater anaerobic metabolism causing fatigue to occur more quickly.How often should I do aerobic exercise?For general health and fitness benefits, such as reducing your risk of heart disease and improving your stamina, it is recommended that you do some form of moderate intensity aerobic exercise on most, and preferably all, days of the week, for a minimum of 30 minutes a day. This 30-minute total can be made up of shorter 10-minute sessions, if this is better suited to your day. These short sessions will still provide health benefits and produce some fitness improvements, although to substantially increase your fitness you probably need to include at least some 30-minute sessions in your week.To maintain your level of aerobic fitness, and the health advantages that go with it, you need to keep up a regular aerobic exercise routine. Giving up your routine or doing less exercise will cause your fitness and associated health benefits to decline.It’s also important to avoid prolonged sedentary behaviour, such as sitting continuously for several hours. So, in addition to trying to incorporate exercise into your day, you should also try to break up your sedentary behaviours, for example by getting up and walking around your office for a few minutes every hour, or during the advertisement breaks when watching TV.How hard should I do aerobic exercise?To improve your general health and fitness, moderate intensity aerobic exercise is recommended. However, if you are very unfit and currently do no exercise, even short bouts of light exercise will be of benefit. With continued participation, this light exercise will produce fitness improvements that will enable you to progress to moderate intensity exercise.As a general guide, ‘moderate intensity’ aerobic exercise may make you slightly breathless, but still able to hold a conversation, and you should be able to sustain this level of exercise for at least 30 minutes. An example would be when going on a brisk walk, jog or bike ride with a friend.If you want to be more exact in determining your exercise intensity, then you can use your heart rate as a guide. Moderate intensity exercise is likely to increase your heart rate to between 55 and 70 per cent of your maximum heart rate. More vigorous exercise will increase your heart rate even further.How to estimate your maximum heart rateHow to estimate your maximum heart rateYour maximum heart rate in beats per minute = approx 220 minus your ageBut this is a rough estimate, and there is a lot of individual variation. (Your maximum heart rate tends to decline by about 1 beat per year with increasing age.)You can estimate your maximum heart rate by subtracting your age in years from 220. For someone who is 40, for example, their maximum heart rate would be estimated to be around 220 minus 40, which is 180 beats per minute. So, during moderate intensity exercise, this person could expect to have a heart rate between 99 and 126 beats per minute (55 to 70 per cent of their maximum heart rate). However, this is just a rough estimate, and some people can have maximum heart rates more than 20 beats above or below that estimated for their age. So it’s a good idea to also use your perception of how hard the exercise is — the guide of being slightly breathless but able to hold a conversation is a good one.Beta-blockers and exerciseBeta-blockers are one type of medicine used to lower blood pressure as well as treat angina and certain heart rhythm disorders. They work by slowing down the rate at which the heart beats. People taking beta blockers should talk to their doctor about their planned exercise programme. Moderate intensity exercise is often recommended for people taking beta-blockers, but since the heart rate calculations described above do not apply to them, the best guide to determining a suitable exercise intensity is their perceived exertion.Measuring your heart rateIf you do not possess a heart rate monitor, an easy way to measure your heart rate is to count your pulse for 10 seconds then multiply this count by 6 to calculate your heart rate per minute. To find your pulse, locate either your carotid artery (found on the side of your neck, just under your jaw bone) or your radial artery (in your wrist at the base of your thumb). Then gently place your index and middle fingers over the artery, but don’t press too hard or you will stop the flow of blood in that artery and not be able to detect a pulse.Be aware that aiming for a target heart rate when exercising is a rough guide and may not work for some people. Older people who are physically fit may have a higher maximum heart rate than a younger, less fit person, and a higher maximum heart rate than that given by subtracting their age from 220.Progressing to greater levels of fitnessIf you are already active and getting 150 minutes of moderate intensity exercise a week but want to attain a higher level of health and fitness, you will need to increase your aerobic exercise levels, either by exercising at a higher intensity and/or by doing more exercise.Vigorous aerobic exercise — exercising at 70 to 85 per cent of your maximum heart rate — will result in further fitness and health gains. As a guide, at this intensity you will be breathing hard and finding it difficult to talk in full sentences between breaths. This level of exercise is more strenuous and should only be contemplated if you are already accustomed to regular moderate intensity aerobic exercise. To prevent ‘overdoing it’, it is a good idea to alternate between moderate and vigorous exercise days with, for example, 30 or more minutes of vigorous aerobic exercise on 3 or 4 days a week, interspersed with days of 30-60 minutes of moderate intensity aerobic exercise.For people undertaking high-level sports training, a qualified trainer is likely to develop an individualised programme that varies from the above guidelines with regard to the intensity (how hard), the duration (how long) and the frequency (how often) of the aerobic exercise sessions. This is because the main aim of their training is to improve their sporting performance - the associated health benefits that accompany this are a fortunate side benefit, rather than the main goal.A balanced fitness programmeFor people of all fitness levels, aerobic exercise should form part of a balanced exercise programme that also includes 2 to 3 sessions per week of exercise to increase muscle strength, e.g. resistance training; and some stretching and flexibility work, e.g. a basic stretching routine or attending a yoga class. Needless to say, healthy eating and plenty of rest will complete a well-rounded fitness programme.Aerobic exercise precautionsAppropriate aerobic exercise is recommended for almost everybody, regardless of age, but may need to be modified to ensure its suitability for people with existing health problems.If you have existing health problems, are at high risk of cardiovascular disease, or have muscle, bone or joint injuries, check with your doctor before undertaking an aerobic exercise programme. Also, men aged over 40 years and women aged over 50 years who have not exercised regularly in the recent past should check with a doctor before undertaking a programme of vigorous physical activity. The level and type of exercise may be adjusted to ensure that it can be undertaken safely and effectively.As with any form of exercise, be aware of over-exercising, either by doing aerobic exercise too hard, for too long or too often. This approach can lead to injury and abandonment of your fitness programme. Remember to build up gradually from your current activity level, and not to progress too rapidly. If you are new to regular aerobic exercise, several weeks of low to moderate intensity aerobic exercise are usually advised before introducing more vigorous aerobic exercise sessions. When you do increase your level of aerobic exercise, increase only one component — the intensity, duration, or frequency of your aerobic exercise sessions — at a time.It’s never too late to startAn important health and fitness message is that people of all ages can benefit from regular aerobic exercise. And, if you are unfit, unhealthy or an older adult, you may have the most to gain from including it in your lifestyle. Last Reviewed: 24 March 2015
Which one you choose is a personal choice. They are not intended to compete with each other but rather to provide options and maybe even complement each other. For instance, the Surgeon General's recommendation may be more practical for individuals who are unwilling, or unable, to adopt the more formal ACSM recommendation. Of course, there's no downside to working out regularly with aerobic exercise and also becoming more physically active as per the Surgeon General (take more stairs, mow the lawn by hand, park far away from the store and walk), so combining them might be a good decision.
Aerobic exercise (also known as cardio) is physical exercise of low to high intensity that depends primarily on the aerobic energy-generating process.[1] "Aerobic" means "relating to, involving, or requiring free oxygen",[2] and refers to the use of oxygen to adequately meet energy demands during exercise via aerobic metabolism.[3] Generally, light-to-moderate intensity activities that are sufficiently supported by aerobic metabolism can be performed for extended periods of time.[1] What is generally called aerobic exercise might be better termed "solely aerobic", because it is designed to be low-intensity enough so that all carbohydrates are aerobically turned into energy.
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