@Aisling It's not a regular lesson, but some schools offer it. Otherwise, you courses on it are being offered by different institutions. If those courses are too expensive, you can go to sports clubs and let your kids take part in martial arts, such as kung fu or karate. That often comes cheaper on the long run, and if you've got a good teacher (with 'good', I mean one who doesn't just focus on martial arts competitions but also makes self-defense a part of the training), martial arts can come in really handy. In addition to the self-defense lessons I had some years ago, I've had some karate lessons last year, and my teacher was really good.