I agree and can confirm the effectiveness of this approach. My dad saw me being bullied in kindergarten. Rather than stopping the bullying himself, he taught me

I agree and can confirm the effectiveness of this approach. My dad saw me being bullied in kindergarten. Rather than stopping the bullying himself, he taught me how to do a choke-hold. The next day he had to pick me up earlier as I was accused of violent behavior - for choking the bully until he turned blue. This lesson, learned so early, helped me a lot in later school life as I was that overweight small kid with thick glasses. And every time someone tried to bully me, I simply slammed my elbow in their nuts. Kids can be mean monsters, they can be worse than any grown up. They have no idea how much harm they are causing. Defending yourself against predators is a very important lesson in life.