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.
Picture yourself working out. Are you lifting heavy weights? Stretching your muscles? Or maybe you're performing an activity that causes you to sweat and breathe hard that makes your blood pump through your veins as it carries oxygen to your muscles to keep you going. If you're performing this last activity, then you're engaging in aerobic exercise.
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Researchers have really been looking into how exercise can help improve the quality and length of our life. Sanjay Sharma, professor of inherited cardiac diseases in sports cardiology at St George’s University Hospitals NHS Foundation Trust in London, pointed out that “Exercise buys you three to seven additional years of life. It is an antidepressant, it improves cognitive function and there is now evidence that it may retard the onset of dementia.”
The technical definition of aerobic exercise is “any form of exercise or activity that uses the aerobic metabolism — meaning oxygen is heavily involved in the cellular reactions that provide the body with the energy necessary to perform activity,” explains Michael Jonesco, DO, an assistant professor of internal and sports medicine at the Ohio State University Wexner Medical Center in Columbus. “You’re making yourself more efficient at delivering oxygen to the rest of the body.”

Walking is one of the simplest ways to get fit and maintain heart health. The American Heart Association's guidelines for physical activity indicate that healthy adults should aim to walk a minimum of 150 minutes per week, or 30 minutes every weekday. Walking seven days per week will burn more calories, and you can add challenges to your walking workout that make it more of a cardiovascular or strengthening exercise.
Every session of aerobic exercise should include a warm-up and cool-down. The warm-up period should not include static stretching, but should instead be a gradual increase in pace and intensity of the exercise. This allows for the body to increase blood flow to the muscles, and decreases the likelihood of a muscle or joint injury. The warm-up should last between 5 and 10 minutes. The cool-down session should last a similar amount of time as the warm-up, with the pace gradually decreasing. Stretching exercises would be appropriate after aerobic exercise.
If you haven’t been active for a while, you may find walking is an easy way to get started. But it will also be important to keep your motivation. Begin slowly and gradually increase how much walking you do. You might find it helps to set yourself goals. There are lots of apps that can count your steps, or you could use a pedometer, so your goals can be specific and measurable.
COMMENTS Walking is one of the best ways to kick your stress eating habits to the curb. It doesn't work in isolation though. The ideal way to beat a stress eating disorder it to meditate, get good sleep and walk around 10,000 steps a day. Experts believe that stress eating is more often a symptom of an emotional or psychological problem. Walking releases endorphin into your system and reverses the cortisol levels in your body, helping you curb stress eating.
One final note. Spin class is interval training. It's done at gyms on special spin cycles with an instructor who barks out orders to increase the intensity and then slow down to catch your breath. It's addictive, and people who do it regularly swear by it. You should already be doing some aerobic exercise and be reasonably conditioned before you try it, but I recommend it if you're looking for one of the toughest workouts around.
Before starting a walking program, check with your doctor if you have a chronic medical condition or if you have had a recent injury. But don't assume that you aren't able to start exercise walking if you do have medical issues. Exercise walking can help control disease progression and relieve symptoms in people with cardiovascular disease and diabetes, and many people with arthritis or other musculoskeletal problems will experience symptom relief from a medically supervised exercise walking routine. Exercise is an important part of all weight-loss programs that will help with many chronic medical conditions.
Indoor cycling is a group exercise class performed on stationary bikes. During the class, the instructor guides you through simulated flat roads, hill climbing, sprints, and races, while you control resistance on your bike to make the pedaling as easy or difficult as instructed. It is a fun, vigorous cardiovascular workout. The instructor, the people around you, and the music help keep you motivated.

Interval training is more intense than simple aerobic training. It's a very effective way to increase your fitness level (remember stroke volume and mitochondria activity!), but it's tough, and so I recommend holding off until you build up to 20-30 minutes of aerobic exercise. The idea to intervals is to set up work to active-rest ratios (work:active-rest), and as you get more fit, decrease the active-rest interval and increase the work interval. The work interval of the ratio is a speed that is faster than what you usually do, and the active-rest interval is your usual speed. To do it, you start at your usual speed for five to eight minutes, then increase the speed to the work interval for one to three minutes, then slow down to your usual speed for a few minutes to catch your breath (this is the active-rest interval), and then you repeat the cycling for the duration of your workout.