"Don't go looking for trouble son, but if someone hits you then hit them back as hard as you can"
That was my dads advice on my first day of school. It stood me in good stead. People tried to bully me in my younger days and they got a fat lip and left me alone. Different times then, granted, and every child is different I guess.
This was what i was taught and done me well. When i was little in 1st school i didn't fight back but i was the little kid and my dad kept telling to hit back, then the day came when i did and they stopped.
I think martial arts is good confidence booster for kids and teachers them to defend them selfs. I started at the age of 6 and stopped at 17. But it does have a draw back, as once you reach high school the bullies learn this about you and want to see what your made of. Most of them tried me once and didn't bother me again. All the way through school i was left alone once they knew i fought back and hit harder then most of them. I still had one or two who wanted a go.
Now my daughter is 5 soon to be 6 and last year was getting bullied by a older boy. My wife didn't want me to teach her to fight back and went to the school and they were excellent in trying at first. But they still missed it a few times and after my daughter hurt her head thanks to the little tw*t, the wife finally had enough and went telling the head that i will be teacher her to fight back if it continues. The school quickly found the boy and was dealt with.
To this day i still haven't had to teach her to defend her self, but i have told her that same as my dad told me. Sense then nothing has happened and she still my happy little girl.