I want my kid to get exercise but this ...

My son is taking Krav Maga lessons, Krav Maga being a martial arts technique developed by the Israeli army.

I did some research on this fighting style and discovered that Krav Maga "generally assumes a no quarter situation; the attacks and defenses are intended to inflict the most pain possible on the opponent in the least amount of time. Groin strikes, headbutts, and other efficient and potentially brutal attacks are emphasized."

Hmm, it's bad enough to have a teenager who sasses back, now I have one who can snap my neck!