The work out for the class

On Tuesday, we run 4 laps in stadium in class. In 3 laps we went up the hill, once just normal run, once run backwards, once doing lunge. 4 laps count 1.5 mile, according to instructor. Then we climbed the stairs from bottom to top of the seats. I was very slow and the last one. I am a little bit afraid of the stairs.
On Thursday, we run the hill in front of the fraternity buildings. We run 4 laps, between each we did 10 lunge for each legs. Most people finished four laps when I started the forth. However, I finished 4 too and I know a few did not. It was 0.5 mile for each lap, and total 2 miles for the training. My ankle hurt a lot when I was running up hill, I never have had this before. I am afraid of injury, and I am going to have a race on Sat. morning. I will not doing any leg exercise before the race.