格闘技の経験が全くない者同士が対峙した場合、誰もが「筋肉質な大男」が最も強く、「背の高い男」がそれに続き、「小柄な女性」が最も不利だと考えるでしょう。物理的な体格差は無視できない現実です。

しかし、武術の真髄は「どのシステムがその勝率を覆せるか」にあります。
特に体格で不利な女性にとって、どの武術が本当に有効なのか。私の格闘技経験に基づき、考察してみます。
1. 競技スポーツとしての格闘技の限界多くの人は護身のために競技格闘技を選びますが、体格差が激しい場合、いくつかの壁に突き当たります。

• 柔道: 自分より遥かに重い相手を投げるのは至難の業です。また、打撃への対処が想定されていません。
• キックボクシング・空手: 打撃の威力は体重に比例します。小柄な人のパンチやキックでは、突進してくる大男を止めるだけの「停止力」が不足しがちです。
• BJJ（ブラジリアン柔術）: 「小よく大を制す」と言われますが、寝技に持ち込む過程で体力を消耗します。下になった場合、相手のパワーで技術が封じられるリスクも高いのです。

2. 合気道やチンナ（擒拿）関節技を主体とするこれらは、相手が本気で抵抗し、かつ圧倒的な筋力差がある場合、技をかけること自体が非常に困難になります。

詠春拳が「生存率」を高める理由私は詠春拳の指導者として、多くの小柄な練習生を見てきました。純粋な「勝利」ではなく,「生存（サバイバル）」を目的としたとき、詠春拳には大きなアドバンテージがあります。
体格差を克服するために、詠春拳は2つの戦略をとります。
① 「戦うのが面倒な相手」になる 詠春拳特有の連打（チェイン・パンチ）と絶え間ないディフェンスは、相手を翻弄します。激しく動き続け、痛みを与え続けることで、「この獲物を仕留めるのは割に合わない」と相手に諦めさせるのです。
② 「バイオロジカル・イコライザー（生物学的弱点）」を突く どんなに筋肉があっても、目、喉、股間、膝といった急所は鍛えることができません。詠春拳はこれら脆弱な部位を最短距離で攻撃することに特化しています。これは筋力に頼らない「技術による平等」です。
結論物理法則を無視することはできません。しかし、弱点への的確な攻撃と、相手のコントロールを目的とした詠春拳のシステムは、小柄な人が自分を守るための最も現実的な手段だと私は確信しています。

In a raw physical confrontation with no training involved, most people would bet on the muscular athlete first, the tall/lanky individual second, and a smaller woman third. Physicality matters. But the real question for martial artists is:

Which system actually changes those odds?
Since a smaller woman has the most to gain from training, let's look at how different styles hold up when she is faced with a much larger, stronger male opponent.
The Limits of Combat SportsMany people turn to competitive martial arts for self-defense, but these systems often rely on attributes that a smaller person simply doesn't have against a "giant."

• Judo: Throwing or tackling a much heavier opponent is mechanically exhausting. Furthermore, Judo offers little protection against the punches and kicks that occur before the clinch.
• Kickboxing, Muay Thai, & Karate: Power in striking is heavily tied to body mass. A lightweight fighter’s strikes may not have the "stopping power" required to halt a charging, muscular attacker.
• Boxing: While excellent for footwork, a small person’s reach disadvantage makes it incredibly dangerous to get close enough to land a meaningful blow.
• Brazilian Jiu-Jitsu (BJJ): BJJ is often touted as the "giant killer," but it requires getting the fight to the ground. For a small woman, being pinned under a much heavier opponent is a high-risk strategy where raw strength can often overpower technical locks.

Traditional Self-Defense SystemsWhat about styles designed specifically for defense?

• Aikido & Qin Na: While the philosophy is beautiful, joint locks are notoriously difficult to apply against a resisting opponent who is significantly stronger and more aggressive.

Why Wing Chun Changes the Math
As a Wing Chun teacher, I’ve spent years training with and observing smaller practitioners. When the goal is survival rather than winning a trophy, Wing Chun offers a different strategic path.
If the odds of "winning" a fair fight are slim, a smaller person must pivot to two specific goals:

1. Making the Attack "Too Expensive"Instead of trying to out-muscle an attacker, Wing Chun uses "chain techniques"—continuous, vigorous movement and defense. By becoming a "moving target" that inflicts constant, stinging pain, you make it too much trouble for the assailant to continue. The goal isn't necessarily a knockout; it’s making the attacker decide that you aren't a victim worth the effort.

2. Targeting the "Biological Equalizers"Strength cannot protect the eyes, the throat, or the groin. Wing Chun prioritizes direct, efficient strikes to these vulnerable areas. A well-placed kick to the knee or a strike to the throat works regardless of how much the opponent benches.

Final Thoughts
In the world of maximum self-defense, we have to be realistic about physics. You cannot "out-strong" a much larger opponent. However, by focusing on relentless pressure and attacking vulnerable anatomy, Wing Chun provides the best toolkit I have seen for improving a smaller person's odds of going home safe.

You can also find an English version of this on the blog page:
​ https://www.jsgym.net/blog/faq-about-self-defense-and-other-systems-and-our-goal

I often get asked about self-defense and for example aikido or what do you think about Russian (Systema) or Indonesian (Silat) martials arts? And which is better, wing chun or Jeet Kune Do (JKD)?

The short answer to all of these is that Aikido is not very good self-defense. I'll write more about why not some other time. For now just trust me, choose Aikido for all other reasons than for self-defense.

I haven't seen or tried any Russian, Indonesian martial arts, kicking or grappling arts, that has much to offer to my goal which is:

to find the best, most simple and effective way to defend and fight for yourself under any circumstances, for any person no matter height and weight.
And it has to be speedy, enabling the practitioner to stop the opponent quickly
to avoid the need for lot's stamina training).

Furthermore, this simple method has to be able to deal with standup fighting, takedown attempts, attacks by multiple opponents and opponents armed with weapons. All of these attacks have to be able to be dealt with on any surface and both in a confined or in an open space. 

So considering my goal choosing between Wing Chun and JKD is easy.

Wing Chun is just much better for realistic fighting, whereas a lot of (Japanese) JKD seems to be for actors looking for fast and flashy looking but not necessarily effective techniques. 
(But all Japanese JKD might not be the same, like not all wing chun is the same. So you might be lucky to find a great JKD teacher, likewise when I write about wing chun, it's only about J's GYM wing chun.)

日本語版：https://www.jsgym.net/blog/self-defense-jeet-kune-do-aikido-goal