Walking is the easiest and simplest form of exercise. By putting one foot in front of the other, you can start to walk your ways towards a healthier lifestyle. Walking is an easy way to challenge the cardiovascular system (心血管系统) , while at the same time building muscles. But to achieve these goals, a little more than a gentle walk around the block is required.
Walking actually burns as many calories (卡路里，热量单位) as running the same distance——if done in the correct manner and at a reasonable pace (步伐).
Start with a basic program that you can complete three or four times a week. This should include five main steps:
—A beginning warm-up for about 5 minutes.
—A little bit faster period of 5 minutes at medium level (中等速度)
—A 10-minute "burning" at a high level.
—A 5-minute cool down period at a low level again.
A suitable walking pace of around 5 kilometers per horn will burn around 80 calories in 30 minutes.
Compared with running the same distance, walking in the recommended way burns _______.
A．fewer calories B．more calories C．a fixed number of calories D．the same number of calories