Higher intensity exercise, such as High-intensity interval training (HIIT), increases the resting metabolic rate (RMR) in the 24 hours following high intensity exercise,[24] ultimately burning more calories than lower intensity exercise; low intensity exercise burns more calories during the exercise, due to the increased duration, but fewer afterwards.

When running isn't in the cards, walking with added weight might be your next best bet for an effective workout. Research shows that walking on the treadmill while wearing a weighted vest can increase the metabolic costs and relative exercise intensity.The effect of weighted vest walking on metabolic responses and ground reaction forces. Puthoff ML, Darter BJ, Nielsen DH. Medicine and Science in Sports and Exercise, 2006, Jun.;38(4):0195-9131. Similarly, increasing the incline on the treadmill makes for a more effective walking workout. A study showed that walking at a slow speed (1.7 mph) on a treadmill at a six-degree incline can be an effective weight management strategy for obese individuals, and help reduce risk of injury to lower extremity joints.Energetics and biomechanics of inclined treadmill walking in obese adults. Ehlen KA, Reiser RF, Browning RC. Medicine and Science in Sports and Exercise, 2011, Oct.;43(7):1530-0315. And picking up the pace slightly almost always helps. One study found speed walkers had a decreased risk of mortality over their slower counterparts.The relationship of walking intensity to total and cause-specific mortality. Results from the National Walkers' Health Study. Williams PT, Thompson PD. PloS one, 2013, Nov.;8(11):1932-6203.

Triglycerides are a common form of fat that we digest. Triglycerides are the main ingredient in animal fats and vegetable oils. Elevated levels of triglycerides are a risk factor for heart disease, heart attack, stroke, fatty liver disease, and pancreatitis. Elevated levels of triglycerides are also associated with diseases like diabetes, kidney disease, and medications (for example, diuretics, birth control pills, and beta blockers). Dietary changes, and medication if necessary can help lower triglyceride blood levels.

Inevitably, this made me a little smug; equally inevitably, it made me tell anyone who’d listen that they, too, should do this amazing thing I was doing. Walking is the only thing I ever evangelise about, because, unlike everything else that makes me feel good (meditation, Jaffa cakes, the fantasy fiction genre, the TV show River and buying a good Flat White) walking is the one thing I truly believe will work for everyone. Anyone who can walk, should walk.
“Cardiovascular health is defined by your capacity to exert yourself,” says Nicole Belkin, MD, an orthopedic surgeon at NewYork-Presbyterian/ Columbia University Medical Center. “Regular physical activity trains the cardiovascular system to expand the level of demand and increase its capacity. This results in increased blood flow and blood volume to the heart.”
“Those who had a faster stepping rate had similar health outcomes—lower BMI and lower waist circumference—as those who took the most steps per day,” says Schuna, one of the study authors. He recommends trying for a minimum of 100 steps per minute (roughly 2.5 to 3 miles per hour) or as brisk a pace as you can (135 steps per minute will get you up to about a 4 mph pace).
The extra effort and calorie burn are partly the result of the faster pace. Because you walk faster, you cover more distance in less time. The farther and faster you go, the more calories you burn. Simple as that. But fitness walking is an effective exercise for another reason, too: You use more muscles. Your hips and butt get more into the act. And, as a result of your powerful arm swing, so does your upper body.

Dr. Tannenberg offers another tip for incorporating intervals into your workout: “Create a new playlist with upbeat songs followed by slower songs. Alternate the songs on your playlist. When you are walking and hear a faster song, you increase your pace. When the slower song comes on, you slow down the pace a bit. This is an easy way to make your normal morning walk an interval workout.”

Harvard Medical School notes that walking is an ideal form of exercise because of its simplicity. While other exercises can take a period of adjustment that can occasionally be frustrating, walking is a natural movement that doesn't require you to be a finely tuned athlete. The benefits of aerobic exercise, notes the Cleveland Clinic, include more cardiovascular endurance, better lung capacity and a lower risk of heart-related ailments. Exercises such as walking also help you to manage your stress.

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.
Some of the most interesting and overwhelming evidence supporting the need to be physically active is from the research being conducted at the Cooper Institute for Aerobics Research in Dallas, Texas. Dr. Kenneth Cooper, known as the "father of aerobics," founded the Cooper Clinic in the early 1970s to investigate the effects of physical activity and fitness on health and longevity and to help people develop healthy lifestyles.
One way to ensure success is to build some competition into your fastest walks. Or train for a “running” race where you start in the back and don’t worry about your time compared to those around you. “You don’t need to try to win,” Fenton advises. “Merely being part of a racing environment with large numbers of other fitness-minded individuals will guarantee that you get a good workout.” Most runners consider walkers their equals, regardless of when they cross the finish line.
There ins and outs of different methods of measuring your walking speed. Cell phone apps and running speedometer watches use GPS, which can be inaccurate and won't work indoors on a treadmill. Fitness bands and pedometers may use your step cadence, which can vary if your stride length is different from what is expected. You can verify the accuracy of these readings by walking a measured mile and calculating your walking speed and pace.
Update: the authors removed a sentence about the human body operating on physiology rather than physics. This sentence was in reference to 500kcal exercise not directly relating to the number of grams in 500kcal of fat as determined by typical bomb calorimetry. This is due to the various ways individual physiology treats energy intake and energy expenditure. The authors decided to remove the sentence since it lacked the additional context behind the statement. 

Vary your walking workout to keep it interesting and you will also burn more calories. Incorporate a couple of inclines into your walking route. If you exercise on a treadmill, set it at a slope for part of the time. Walking more extreme inclines makes your workout more like hiking, which burns twice the amount of calories than walking on a flat route.
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