Walking is the earliest and simplest from exercises. By putting one foot in front of other, you can start to walk your ways towards a healthier life-style. 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) 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 minutes "burning" at a higher level.
-A 5 minutes slow down period at a medium level.
-A 5 minutes cool down period at a low level again.
-A suitable walking pace of around 5 kilometers per hour will burn around 80 calories in 30 minutes.

Which of the following is TRUE about the suggested walking program

A. Effective walking lies in the gradual increase of speed.
B. The same pace should be kept throughout the walking.
C. One should not stop suddenly while walking fast.
D. One should change one’s walking patterns every 5 minutes.