I can't believe I made the track team. After all, I have never been very athletic. In fact, my parents call me a couch potato. My coach, Mrs. Lopez, is very supportive and reminds me that if I work very hard I will be running at breakneck speed in no time.
The underlined idiom "running at breakneck speed" means running very fast or at an extremely high speed.
The underlined idiom, "running at breakneck speed," is typically used to describe someone or something moving or progressing very quickly and recklessly.
The underlined idiom "breakneck speed" is often used to describe very fast or dangerously high speed. In this context, it means that with hard work and dedication, the person will be running very fast in no time. To understand the meaning of idioms, you can refer to online idiom dictionaries or search for the phrase with the word "idiom" included.
