Challenging the impossible

Recalling my life, is there something I ever thought impossible and after doing harder then become true? I searched for it through my mind and I remembered one thing. It was when I was in high school. The school required every student to take an eight hundred meters running exam and the grade would be taken as one of the standards to appraise excellent students. I was not good at sports especially at running. My grade for eight hundred  meters running is far below pass line. But I wanted to be elected as an excellent student. Therefore I was determined to make some efforts. Since then, I gotten up at five o’clock everyday in the morning then gone outside to do jogging. One month later came the running exam. I was a little confident of the exam. I got a good grade and did not feel that tired. I remember I was very happy about it. And I was appraised as an excellent student that year.