For example, a 154 pound person running at a pace of 8 mph burns 320 calories in 20 minutes. That same person, walking at 3 mph for an hour, burns 235 calories.
Although such shorter, high-intensity workouts build fitness fast while burning a lot of calories, they aren't right for everyone. They're not recommended for a novice exercisers because they can contribute to injuries in individuals who aren't prepared for the physical demands of this type of workout. They are also hard to maintain and should be used sparingly. Even a highly fit athlete should vary his workout and have some long and slow days for endurance and recovery. Finally, if you work at a high intensity, odds are you will fatigue sooner and be forced to stop after about 20 minutes. If you go slow, you will likely to be able to continue exercising for several hours.
The sort of exercise you chose depends upon your ultimate goal. If you are training for mountaineering or backpacking, you'd better plan some long, steady days of hiking. If you want to lose those newly acquired holiday pounds, give the high intensity workout a try.
Keep in mind that if you have specific training goals you should adhere to the principles of conditioning and follow an appropriate training program for your sport.
It is recommended that you see your doctor before starting an exercise program if you're older than age 40 and have never exercised, a smoker, overweight or have a chronic health condition.
Calorie Counting Tools