What is the best cardio exercise?

If you want to burn fat, then doing some form of cardio is a must.

Burning fat with cardio exercises, eating healthy, and doing a few abdominal exercises to tone your stomach muscles is the best way to get a beautiful flat stomach.

Well there is no "best" cardio exercise. You can do anything that gets your heart rate up.

If you like to go outdoors, consider fast-paced walks, running, cycling etc. For those who like the gym treadmills, elliptical trainers and stationary bikes could be the choice. If you prefer to stay at home you can jump rope, dance or start kick boxing.

Do something you enjoy, something you would not mind doing at least three times a week. Most importantly choose an exercise that fits your fitness level. Sure, running burns more calories than walking, but if running bothers your knees, you're better off walking.