Self-defense classes are popular around the world. The personal protection techniques are a cornerstone part of martial arts training and teachings. You don’t need to take a martial arts class to learn self-defense since there are countless courses given that specifically deal with how to defend yourself in real world situations. These are usually offered commercially for profit and target a specific audience, such as self-defense for kids, pre-teens, teens, adults, women, and so on.
Some of us also take alternative steps to stay safe. We lock our doors, park in well lit areas, and carry mace or pepper spray along with us wherever we go. Even with all these precautions and more, it cannot ever hurt to be extra prepared for circumstances we never expect to be in; like tied up with duct tape.