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 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 slow down period at a medium level.—A 5-minute 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.