"All right then—just one more piece…"Words every girl has said when they are faced with the delicious cheesecake. Of course, many of us know we may eat the whole thing in the end.
It isn't just girls. Most of us find it hard to say "no" to something attractive. However, scientists now say that willpower（意志力） is very important for success and a happy life. Scientists in different countries have been studying the influence of willpower on people's lives for a long time. In one study, scientists told young children that they could either have one candy now, or two candies in 15 minutes. Waiting of course needed more willpower. Scientists then continued studying the children as they grew up. They wanted to see if some children always had stronger willpower. They also wanted to see how having stronger willpower influenced their lives.
Years later, scientists found that the children who had waited for two candies were all healthier, happier and richer adults. But there is hope, Roy F Baumeister, an American expert told us that we can train our willpower just like we train our muscles（肌肉）. Even a little practice can make our self-control stronger.
You could start by making yourself stand up straight, speaking in complete sentences, or using a computer mouse with the other hand. Scientists have found that people who are able to change little habits perform much better in willpower tests.
Like muscles, willpower can" get tired". Don't try to do too many things at the same time, or when you don't have enough energy, for example, when you are ill. If you already feel tired, you can try to recharge（恢复） your willpower with a good night's sleep and by eating well.
