Muscular pain

I went to a part time job yesterday. I had four hours. The first time, I watched around the pool. Then, I teached children swimming three hours. The last class, I teached alone, so I was tired. After working, I and my colleague decided to swim. There is a swimming meet on June 27th. I am going to participate in it. I will take part in the freestyle. So, I and my colleague practice every after working. Because of that, I have muscular pain now. I enjoy swimming and it is very good for myself.(98words)