There is no standard self defense class
A quality self defense should address all 4 phases of assault. This should include certain elements such as awareness, assertiveness, verbal confrontation skills, and physical skills that not only teach how to resist a violent attack but how to escape and survive. This should require no special athletic ability or strength. Techniques and strategies should maximize effect using balance and leverage. The instructor should respect concerns of the students respecting their experience and ability level.
Although there is no guarantee when it comes to self-protection studies have shown that women who have taken self defense courses are less likely to be the victim of sexual assault. A basic course should offer enough skills and techniques that you can successfully defend yourself in a wide variety of situations. Programs range from 1-3 hour overviews to comprehensive 8-12 week courses. Whichever you choose remember this is one of the most positive acts