Fight Like a Physicist: A Female Martial Artist’s Honest Review
The first time I saw the title “Fight Like a Physicist”, I was heading out to a training session. This title grabbed my attention instantly because I wanted clear answers. I wanted to hit harder, spar safer without losing intensity, and understand why certain techniques work, not just copy them.
Jason Thalken’s book promises to connect physics ideas like centre of mass, force, momentum, knockouts, and safety gear with real fighting. In this review, I am sharing how it actually helped me on the mat as a female martial artist, where it fell short, and why I still recommend it to almost every fighter I train with.
What Fight Like a Physicist Is Really About (And Who It Helps Most)
Jason Thalken is not just a fan with opinions. He has a PhD in physics and a long history in martial arts, including a hapkido black belt and experience in several styles, which you can see in his author bio at YMAA. That mix of lab brain and mat time shapes the whole book.
At its core, Fight Like a Physicist is a simple guide to how physics shows up in striking, grappling and self defence. It covers balance, centre of mass, energy, momentum, impact, knockouts, and how safety gear affects your brain. The tone is casual, sometimes even playful, which makes it easy to read after a long training day.
This is not a dense textbook. It feels more like a bridge between what you already feel in drills and the science behind it. For beginners and mid‑level practitioners, or for anyone who keeps asking “why does my coach keep yelling about hips,” this book lands well. On Goodreads, many reviews praise it as a clear primer, and I agree with that. If you are a pro fighter or a hardcore physics nerd, some parts will feel basic, but the mindset is still useful.
Simple Physics Behind Real Fights: Centre Of Mass, Force And Angles
The strongest part of the book for me is how it explains centre of mass, balance, and angles without drowning you in formulas. Thalken breaks down why shifting your weight before a cross loads more energy, why a solid stance keeps your base under your centre, and how tiny angle changes in a punch or kick turn a glancing shot into a clean impact.
I remember re‑thinking my round kick after reading his take on momentum. He talks about how your hips and torso build speed first, then transfer it down the chain. When I focused on that, instead of just “kick harder,” my shin started landing with a deeper thud. It felt less like effort and more like letting physics do the work. Articles like this momentum guide for fighters talk about similar ideas, but the book ties them straight into what you feel in training.
He does the same with throws and sweeps. Centre of mass goes past the base, balance is gone, gravity finishes the job. No mystery. Just clean cause and effect that you can test in the gym.
Safety, Knockouts, And Brain Health: The Hard Truth I Needed To Hear
The concussion and knockout chapters hit me hardest. Thalken explains what a knockout really is in physics terms, how the brain sloshes in the skull, why sudden acceleration and stops do the real damage, and how gear changes the forces, sometimes in ways we do not expect.
Reading that as someone who spars with bigger partners was sobering. He breaks down how gloves and headgear can spread out cuts but might not save you from the brain shaking inside. After that, I stopped treating “hard sparring” as just a brag and started treating it as a cost.
The book pushed me to:
- Use my defence and footwork to avoid clean punches , not just show toughness.
- Be pickier about headgear and gloves, instead of grabbing whatever is cheap.
- Talk with my instructor about limits for hard sparring and recovery days.
Now, when I choose gear or decide how hard to go, I am not guessing. I am thinking about forces, acceleration and my long term health.
My Personal Take As A Female Martial Artist: What Hit Me, What Fell Flat
As one of the few of the woman in a mostly male dojo, I live with power gaps all the time. Guys can throw lazy punches that still shake me. If I get sloppy with my structure, I get walked down. That is my daily reality and it shaped how I read this book.
What I loved is that Fight Like a Physicist gave me a language for problems I already felt: getting off‑balanced in clinch, getting hit harder even when someone “holds back,” or struggling to move heavier partners on the ground. It did not magically erase size differences, but it gave me tools to close the gap.
Some online reviews say the book is basic for experts. As someone with a decent amount of mat time, I partly agree. But here is the thing: what makes you better is not fancy theory; it is applying simple ideas with ruthless consistency. On that front, the book delivers.
How Physics Helped Me Hit Harder Without Getting Bigger Or Stronger
After reading about momentum and centre of mass, I picked two techniques to tweak: my cross and my hip throw.
For the cross, I started thinking in this simple chain: ground, hip, shoulder, fist. I pushed off my rear foot harder, let my hip rotate first, then let the rest follow instead of punching with my arm. The more I thought of “swinging my centre through the target,” the heavier my shots felt. My instructor commented on my power within a week, and I had not added a single pound of muscle.
On hip throws, I stopped muscling people and focused on putting their centre past their feet. I sank my own weight a little lower, stepped deeper, and rotated so their line of balance was already broken before I tried to lift. That small change let me throw bigger guys with less strain on my back. For a woman facing stronger partners, that felt huge.
Being Smaller And Lighter: Why This Book Gave Me A Fair Fight
When you are the lighter fighter, it is easy to feel like you are always behind. Strong partners can post out of sweeps, stand up from side control or stuff your clinch just by being stubborn.
The physics lens helped me stop fighting strength with strength. I started hunting for angles that shifted their centre of mass just a little, then using timing rather than force. In sparring, that meant working off‑line entries instead of trading in front. In jiu‑jitsu, it meant setting grips that tilted them before I bridged or hip‑escaped.
There is something powerful about being able to say, “This works because your centre is here, your base is there, and gravity is my friend.” People who might have brushed me off as “technical for a girl” listened more when I could explain the science behind my choices. That respect matters, especially for women in male dominate dojos.
What I Did Not Love: Where The Book Feels Basic Or A Bit Thin
I will be honest. Some chapters feel like they stop just when I want them to go deeper. If you already read about sports science or follow research on things like the physics of martial arts kicks, you will recognise many ideas.
I also wanted more step‑by‑step training drills. Thalken explains concepts clearly, but he does not always walk you through how to test them in class beyond simple thought experiments.
And as a woman, I noticed the book does not really address gender dynamics, strength gaps, or social pressure in the dojo . It treats fighters as bodies, which is fair for physics, but real training has extra layers: ego, bias, fear of being “too fragile.” I would have loved a chapter that linked the science to those realities.
Still, the core physics is solid and useful, even without those extra pieces.
Why I Recommend Fight Like a Physicist To Every Martial Artist
Despite the flaws, I recommend Fight Like a Physicist to almost everyone who puts on gloves or a gi. If you are a beginner, it will speed up your understanding of balance, power and safety. If you are an intermediate student, it will sharpen things you already “know” but might not apply with intent.
Instructors, especially those who teach kids or smaller students, can use the language in this book to explain why good form beats reckless effort. Smaller or female fighters can use it to build a smarter style that does not dig their body into a hole. And anyone who cares about staying sharp at 40, not just tough at 20, should read the sections on brain health.
Even when the content feels basic, it encourages a powerful habit: question your technique, measure results, and train smarter, not just harder.
How To Use This Book In Your Training, Not Just Leave It On A Shelf
To get real value from the book, I suggest:
- Pick one chapter, like centre of mass or knockouts, and test one idea in your next class.
- Use the safety and concussion sections to start a real talk with your instructor about sparring rules and gear.
- Re‑watch your sparring or competition footage and look for centre of mass shifts and glancing blows, both yours and your partner’s.
- When you help newer students, borrow the simple physics language to explain why a stance or angle works instead of saying “just because.”
Treat it like a reference you return to, not a one and done read.
Conclusion
Reading Fight Like a Physicist helped me connect what I feel in training with clear science, and that matters even more to me as a female martial artist who often moves with larger partners. The book is not perfect, and it is not a dense, advanced manual, but it gave me concepts and words that improved my striking, balance, and choices about sparring and safety.
I now think about my centre of mass when I throw, about momentum when I punch, and about my brain every time I strap on safety gear . That awareness makes me a better, longer‑lasting fighter. If you are curious about the science behind your movement, grab the book, pick one idea, and test it in your next class. Feel the difference in your own body and decide for yourself.