Unit 104：Run for it
第104单元：跑出好身材
Serious runners are renowed for their slender physiques,thanks to the hundreds of calories a good run eats up.
真的跑者皆以体态苗条著称，这都要归功于跑步可消耗好几百卡路里。
If you're a beginner,you'll need to build up your endurance slowly.
如果你是个初跑者，必须先慢慢培养耐力。
For starters,simply walk a block or two，then run a block，then walk again.
对初跑者而言，刚开始先走一两个街区后，再跑一个街区，然后再走。
Slowly increase your distance.about 10 percent a week.
慢慢把距离加大，大约一个星期增加百分之十的距离。
Three times a week over a period of several weeks，try to run longer distances and walk less.
先试跑几个星期.每周跑三次，每次试跑远一点，走少一点。
You may start out feeling like a sorry sack of potatoes，but you'll probably be surprised at how quickly you can progress.
刚开始你也许觉得自已活像是一大袋可怜的马铃薯，但慢慢地你可能会很惊讶自己竟能进步得这么快。
"A runner friend of mine spent a good year hounding me to try it,"recalls Linda McCall，a 35一year--old teacher from St.Louis.
住在圣路易一位三十五岁名叫琳达.麦柯的老师回忆道:"我有一位跑步的朋友唠叨了整整一年叫我去跑步，
"I couldn't imagine dragging my poor body down the street，but I did want to lose 15 pounds，
我无法想象自己拖着臃肿的身躯上街跑步会是什么模样，但是我真的想减掉十五磅。
so a couple of years ago I finally went out one day early in the morning.
所以在几年前的某个清晨，我终于开始外出运动。
I walked a half mile，then ran a block，then walked home.
我先走了半英里，再跑一个街区;然后就走路回家。
The next day, I ran a little farther,and the next day farther still.
隔天，我跑得远一点，再接下来的一天，又跑得更远一点。
Before long，I was running for 30 minutes straight,which I continue to do three times a week.
不久以后，我已可以一口气跑三十分钟，且每个星期持续跑三次。
I'll never run a marathon,but I feel great.
我永远不可能去跑马拉松，但是我感觉很好。
And I've lost 20 pounds一not 15!"
而且我现在已减掉二十磅，而非十五磅！”