An analogy is a comparison between two things, particularly when the comparison is between two things that are quite different from each other. The main purpose of using an analogy is to help the reader understand the connection between them and therefore understand the meaning of the text better. In this case, an analogy could be used to enhance the language of the text and make it more vivid. For example:
"For six months I have been training like a beast and running daily and I barely made the track team. This year the competition to make the track team was tough!"