尊敬的老师们，亲爱的同学们：
大家好!
那是一个阳光明媚的下午，太阳正火辣辣地照射着大地，放佛大地已经灼烧起来。这节课是体育课，我们还要测试400米，老天你是在折磨我吗?要知道我是最讨厌跑步了。每次我都有可能最后一名。随着一声哨响，已经有人跑了一大半了，马上就该轮到我了。这时我想起了每天晚上爸爸妈妈都陪着我到体育馆跑步啊!我走累了到一旁休息时，妈妈就会来到我面前对我说：“累了，不想跑了?就这样放弃了?”我说：“妈，我不可能跑到良好了，最多也只可能跑到合格啊!放弃吧!”可是，妈妈却说：“你想放弃可以，但是你要向我证明，你已经可以坚持到最后了，你难道已经忘掉那些风风雨雨了吗?不和你多说了。”
妈妈就那样走了，我沉默了，然后便自己走回了家。在路上，我想着为什么非要挑战自我呢?只要合格不就可以了吗?紧接着仿佛又有一个声音在召唤着我：“李峥琦，你太让我失望了，好好反省一下吧!这种矛盾让我满脑头疼。
就在这时，我看见一位年迈的老人，她衣衫不整，自己靠着过人的耐力捡着垃圾耐以生存，我想：我的条件比这位老太太好这么多，体力比她好，老太太都能坚持但是我却为跑步这点小事不努力，我太可笑了。想到这我又开始了自己的锻炼……
轮到我了，我开始了跑步，可是我却比别人慢好多，我咬紧牙：加油!我一定行的，我要挑战自我。一个同学被我超越了，两个了，三个了……我看到了终点。YEAH，我终于超越了自己，成功跑到了良好。
我成功超越了自己，世上没有什么事情是一帆风顺的，只有坚持自己的信念才能挑战自己，达到目标。
Challenge yourself !
As we all know, life is full of challenges. Challenge to get into a good school, good college, good job, good position, everything. Some of them are long term, and are generally resolved as time passes. Some of them are short term, and need immediate attention, for example, to finish a very important assignment at school, or to get a job after graduation. Short term challenges create a sense of tension in us, and when they are achieved, we feel happy. They also keep us busy and minds occupied until they are resolved. However, what happens when there are no challenges? There is no tension, the mind gets free. Then we start thinking about doing new things we like in this free time. We go on vacation, eat good food, watch favorite movies, go partying with friends. However, there is still a sense of boredom. When you tell this to other people who are fighting with problems, they laugh on you. There are no problems in our life, which starts becoming a problem. There is nothing to look forward to, no big mountain to climb. Life becomes predictable. We cannot figure out how to get the zing back in life (and creating problems is not the answer). One solution is to create challenges for yourself, doing things that you always thought to be difficult or impossible to do. For example, playing a musical instrument, writing a poem, training for marathon, learning a new sport, or simply watching all the movies involving Woody Allen. These things may not be real challenges, but they surely brings hapiness back to the life when they are achieved. So whenever you think you are bored, take up something you have never done.
As you can see ,we humen live a complex life .We have to struggle for our life ,we struggle for our undertakings,we must deal with seas of problems as well .But ,what brings about this and who will be on duty is us !In a word ,we selves are our enemies so that we have to challenge ourselves .Challenge yourself or you will be behind of others .All of first ,you have to establish an aim ,for you can encourage yourself constantly .secondly ,you have to be firm to keep your aim ,which is easy to give up .And at last ,when you catch your aim ,you will taste happy tears .failure is the mother of success ,but struggle is just success .Challenge yourself ,andyou will not regret this life . With the fast development of the world, we will face more and more challenges. Challenge means not only hardship, but also opportunity. Since we are young people and have glorious future before us, we should not be afraid of challenge. Challenge can inspire our creative power and lead us to success. The most important thing is to deal with challenge properly.
First, we must get ready for challenge at any time, because it comes all of a sudden. Second, you should be courageous enough to face up to it. No pains, no gains. Only through hard work can we achieve success. Finally, make sure that we have adequate knowledge to help us deal with challenge. As for me, I have my own ways to deal with challenge, I'm always trying to challenge myself and conquer myself. Only by means of this can I achieve my ambitious goal.