The focus of this post how self-defense fits into a comprehensive prep plan. It should be obvious (statistics or not) that there are many more opportunities to hurt yourself than to be hurt by someone, and that food and water are essential components of survival, while self-dense is more of a "special scenario" tool. However, I think there's a logical place for at least basic self-defense training in everyone's prep program, particularly training that promotes situational awareness (i.e., avoiding dangerous situations), and deescalation of active threats, in addition to empty-hand combat and weapon use. With each level of intensity comes additional complexity and risk, and a lower chance that it will ever happen to you. So from a prep perspective, this amount of time you focus on self-defense should be scaled appropriately.
But I'm a certified martial arts geek, so my perspective on this is a little different. I started training in Tang Soo Do when I was 14. I was a relatively nonathletic kid, not at all "rough-and-tumble," and hadn't been in any real fights. Then I met this girl at a school dance. Then, the next week I met the guy who thought she was his girlfriend. He told me to stay away from her or he was going to take care of me. This was the first time I ever really had to think about going head-to-head with someone.
I remember asking my parents if I could take boxing lessons at our local Golden Gloves gym where a friend was training. My mom said NO (all caps) to the boxing, but she found a local Tang Soo Do (TSD) school. And although my snarky 14-year-old headbanger self didn't see why getting kicked in the head was better than being punched in the head, I decided to try it. I wanted the skills. I didn't want to start any fights, but if this guy came after me, I wanted to be able to end it. I was hooked almost immediately, and trained there through high school and part of college (testing for my black belt when I was 19 and teaching some classes through the rest of college). It really was a great growth experience and probably made me a more athletic person than I would have been otherwise. I've tried a few other martial arts since then, with widely-varying levels of intensity, including Hapkido, Judo, Capoeira, fencing, Bushido-Kai Karate-Do and Aiki-Ju-Jutsu, but none with the same level of intensity as I did TSD. That is until I started training in Krav Maga a couple years ago at Alliance CrossFit and Krav Maga.
Based on my experience and research, I think Krav Maga is one of the best options for people looking for a "martial art" to supplement their prep. See a neat summary of some of the most brutal and effective martial arts and self defense systems here, but you can find hundreds of lists of lists like this online. Spending a few hours scanning YouTube for real fight videos and "Tae Kwon Do versus Jiu-Jitsu" can be a learning experience, too. The Gracie family has done a great job evolving Jiu-Jitsu, and there are some really neat videos of family members going up against martial arts experts from other styles (with commentary on what went right and wrong).
So why aren't other styles good options for self-defense? There are a few reasons, and it's important to be clear that I'm not saying Krav Maga is THE best system, or that all "traditional martial arts" are equally bad choices. Some are good choices for self-defense. More on that below. But some will fill you with confidence in your skills (like I had) that can actually get you hurt or killed. By the time I tested for my black belt in TSD, I was a pretty serious student, and had won several trophies and medals (actual first- and second-place trophies, not just participation medals) in forms and sparring competitions. In a strange, bureaucratic turn of events that I still don't totally understand, I actually won the black belt sparring division in a tournament the day after testing for my black belt, but wasn't allowed to receive the trophy. Anyway, I think it's fair to say I was good at what I did. Maybe not Olympics good, but above average. So in college I would get together to spar informally with other guys on campus from time to time. Most of us were typical "punch-kick point sparring" guys, and we all fought with the same basic rules of contact. One week, a couple of amateur MMA guys joined us. I still have two vivid memories of that experience: 1) the spinal adjustment (literally) that I received when one of the guys put me in a headlock, and 2) the sore neck I had for the next two days and the feeling of humility (and maybe a little self-shame)
In another college experience a friend asked me what I would do if he did THIS, and executed a quick take-down, pinning me to the ground, where I was helpless. Between these two experiences, I had a serious wake-up call with respect to my training and skills? What good was all the sparring, one-step techniques, pressure points and self-defense tricks if someone could quickly pin me or put me in a headlock?
For prep, the bottom line is that you want a system that that is bare-bones and direct, that it is easy-to-learn and simple-to-implement. You'll probably find this in systems that are actively being developed and tested, rather than those that haven't changed in decades or centuries. Martial arts mystique would have us believe that techniques developed over thousands of years are somehow better than those that have been refined more recently. But that seems backward if you think abut it for long. Similarly, you should consider whether the system you chose emphasizes training for self-defense specifically (like Krav Maga), for sport, or for other reasons like physical fitness, self-esteem, or mental discipline. Yoga is great for physical fitness and mental/emotional discipline, but it won't help you in a fight in any direct way. Neither will being a good runner (though the fitness and mental discipline from yoga and running may help in indirect ways, like running away or being calm when confronted by an attacker).
So for me, for now Krav Maga is a good fit for a prep-relevant self-defense system. For the record, I sought out Krav Maga before I started getting into prep, but only started to see the overlap of the two as the latter hobby developed.
I think Krav is a great option for the following reasons:
1) It is based on instinctive and direct movements. For example, the first choke defense you learn begins with a "plucking technique" because your natural reaction to a choke will be to reach for your throat or the attacker's hands.
2) It emphasizes techniques that incapacitate people, such as groin kicks, eye pokes and gouges, or repeatedly pummeling someone into submission. The underlying philosophy here is eliminating immediate threat. In defense against a handgun, for example, that translates into first re-directing the line of fire before doing anything else.
3) It has a recent military origin (being created by Imi Lichtenfield for the Israeli Defense Force in the mid-1900s). This is important because it means that it was designed for war, rather than sport. Even though many martial arts have military origins, they have lost much or all of their military application, making them inefficient (and very risky) for self-defense.
4) It is hybrid system, including techniques from boxing, judo, karate/TKD/TSD, and jiu-jitsu. This means it focuses on techniques that do a specific job, rather than fit into a specific tradition (e.g., high kicks v. throws).
5) It is a system that's still evolving. Krav instructors continue to test and evolve techniques that are more efficient than traditional ones, or more adapted to nuances of specific modern fighting situations. One of the core tenets of Krav is "If it works, keep it. If not, throw it away." In other words it prioritizes effectiveness over tradition. Isn't that what you want in a system that you're learning to protect yourself?
6) It is physically-intense (at least where I train), and includes pressure tests from early levels. For example, other martial arts often practice self-dense in "one-step" scenarios or other exercises where the attacker is completely compliant with the defender.
Aside: Aikido is often critiqued for this dimension (see Joe Rogan discuss it here and here, and this equally-insightful conversation with Bas Ruten), but all karate/TKD/TSD I've experienced does things the same way. In Krav training, attack and defense intensity are increased over the course of training, even within a single class. While you start with a non-resistant opponent, you end with one who is really trying to get you (and not let you get them). This is all scaled to experience level of course (if you have good coaches like I do). Pressure tests also sometimes include starting with eyes closed and then being confronted by an unknown attack, practicing in the dark, and things like that. Special lessons on fighting in street clothes and in real-world contexts (i.e., walking to your car) are common as well, making Krav training much more realistic than most martial arts. The goal is create situations that are as real as possible while being safe.
7) There is no sport component of Krav Maga, although many people who study it also participate in MMA at some level (e.g., MMA-based sparring classes). This is an interesting reflection point. In boxing and MMA training, you can actually get knocked out (which seems like the ultimate pressure-test, right?). That's one argument for why Krav Maga training might not be intense enough to replicate a real fight scenario in which someone wants to truly do harm to you. Some schools, like Alliance Krav Maga, have worked this into their black belt testing requirement, in which students must engage in a public, competitive fight against someone they don't know personally who is trying to hurt them (e.g., amateur MMA, boxing, kickboxing, and some kinds of wrestling, but not TKD or point karate). Even from my light point sparring days, I can attest that there's something about competing head-to-head with a clear winner/loser outcome that is missing from day-to-day Krav training. But no system is perfect. The reality of fight training is that when you up the intensity, you have to up the rules, too, so that people don't get hurt. So if you want to do "Krav-like" training with 100% intensity, you have to drop the eye pokes and groin kicks or put on all the bulky protective gear (though see this documentary on Dog Brothers events, which are the best example of maximal reality with minimal rules (and still being safe) that I've come across yet. Check out their episode of Fight Science on NatGeo, too!).
Aside: Of all the sport-based martial arts, those that regularly involve intense and close physical contact are probably the best options for self-defense. Those include wrestling, boxing, judo, jiu-jitsu, and stuff like that. And of course MMA. Some will argue that training for rules reduces a person's effectiveness in self-defense situations, but the intensity of training in these sports and effectiveness/brutality of their techniques means that what you learn for the sport has a direct application in self-defense. Further, they all push practitioners past the initial, natural fear of hitting someone and getting hit. Knowing how to do both of those things is priceless in self-defense situations. Know how to gather and direct the energy and intensity to physically over-power someone (whether by knock-out or submission) goes a long way in self-defense.
So I hope you consider finding some way to do some level of self-defense training as part of your prep. My Krav school, for example, runs women's self-defense seminars where a guy in gear grabs you and tries to put you in a van. They also run an active shooter seminar where you learn basic techniques for dealing with active shooter situations (including avoidance/hiding/cover/concealment strategy, as well as efficient tackles).
And surprisingly, all this is actually a lot of fun, and a good way to get in shape, too! :) So even if you never have to use it, you come out ahead in life!