选择阅读: This is not a diet . It's a way to lose weight . And you don't even have to give up the food you love or join a gym . You just follow some habits that thin people have . Keep them , and you'll become thin . (1) Wake-up When you wake up in the morning , sit up slowly without using your hands . With legs straight out , bend( 弯曲 ) forward until you feel sore in your back . It will burn about 10 calories( 热量单位:卡路里 ) . (2) Start with soup When you have a meal , order a clear soup , and have it before having the main food . In this way , you'll feel fuller , so you'll eat less when the main food comes . (3) An apple (or more) a day Apples are full of fiber( 纤维 ) and water , so your stomach will want less . The study shows that people who eat at least three apples a day lose weight . (4) Stand up and walk around Every time you use the mobile phone , stand up and walk around . Heavy people sit on average( 平均 ) two and a half hours more each day than thin people . This skill is very important as standing up and walking around will burn 50 or more calories . Use these skills , and you will have a big weight loss . 根据短文内容,选择最佳答案。