There will be similar boxing gyms, summer classes in sports schools, children's palaces and many other places. Let's just say that professional women's self-defense skills are rare and formal except for martial arts schools and first-and second-tier cities, and most of them are taught by coaches known as cities.
In fact, if martial arts is only for self-defense, it is easier to achieve the effect of electric shock stick and wolf spray, and fighting is a systematic thing, including eye, hand, brain, physical and psychological cooperation, not a single project, light action, less practice. If you meet a truly knowledgeable master to teach you, the average girl can achieve the goal of self-defense in a month or two.
If you don't have a real fighter to take you, you can't get rid of things even after studying for several years. If it is in a relatively large place, it is good to say that most martial arts schools in small and medium-sized cities prefer to "play with people who love martial arts", so that people can learn something ostentatious and enhance their self-confidence. People who have never really fought have never seen the cruelty of martial arts fighting.
In fact, if friends just want to defend themselves in street fighting, it is not particularly difficult to meet the requirements, because it is mainly aimed at ordinary people. If you can, you can go to Sanda gym or boxing gym for a month to deal with one or two ordinary people. If you are going to teach yourself at home, you can actually do it. You can choose a few practical moves to do unique exercises repeatedly, or teach yourself Sanda or boxing, and your friends will meet your requirements.