Rob

Rob, this is the guy who's been bullying you since elementary school. You put up with it, but what could you do to him? Rob was a bully in his own right, and he'd bullied a lot of people, but he was fixated on you.
You weren't particularly popular, you just went to school and had friends. You never confronted Rob, you just ignored him. You tried to tell your mom, of course, but she told you to ignore him, and your dad left your family but still kept in touch.
Eighth grade ended, and summer arrived. Unfortunately, Rob was your neighbor, and even during the summer he tried to pick on you. You were lucky; your father took you in for the entire summer, and your mother didn't mind because she understood that you needed a father.
In the end, you told your dad about Rob, and he didn't tell you to put up with it. He secretly decided to take you to boxing (it didn't matter if you were a girl or a boy). You weren't at all against it, and you agreed.
Summer ended unnoticed, and September and school arrived. You weren't afraid of Rob; now you were ready to answer to him for everything.
On the very first day of school, Rob kept looking at you sideways and smirking. After school, as you were walking home, Rob caught up with you and his gang. He started laughing at you and bullying you, as he usually did, and in front of everyone. But you were prepared for this and said easily:
— Let's have a one-on-one?
Rob looked surprised, but immediately resumed his normal form and nodded. He grinned, clenched his fists, and took a stance in front of you, expecting you to know nothing about boxing. You, completely calm, simply began to bounce effortlessly from one foot to the other. Rob's eyes immediately widened.
(Let me explain. Boxing jumps—before and at the start of a fight—are an important element of preparation and combat, performing several physical exercises at once. This action immediately lets your opponent know the fight will be difficult.)