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Tight Hip, Twisted Core: The Key To Unresolved Pain

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What if the underlying cause of your pain is a tight and unrecognized muscle in your hip that is just waiting for attention?

Do you have pain in your back, tailbone, pelvis, hip, knee, or foot that won’t go away, no
matter what you try?

All of these issues can persist because of tightness in the iliacus
(sounds like “silly yak kiss”), a muscle in your hip that is part of what is commonly called the “hip flexor.”

Most people don’t even know they have an iliacus, let alone understand how it’s affecting their life, causing pain with sitting, exercise, sexual positions, and sleep. The truth is that almost everyone has tightness in this area and this tightness twists the core of the body. As a result of too much sitting, driving, running, biking, kicking, heavy lifting, yoga, dance, gymnastics, or stress, a tight hip could be the missing link to enjoying pain-free life.

In Tight Hip, Twisted Core you will:

- Discover how this muscle impacts your body from head to toe
- Determine if you are one of the millions of people with a tight iliacus muscle and why
- Release the tension in the muscle for good
- Get your body aligned for pain-free performance
- Prevent this muscle from getting tight ever again

Based on decades of physical therapy study and clinical practice, this book outlines 3 simple steps to get your hip healthy and your core aligned, helping you to resolve your pain without expensive treatments, surgeries, and medications.

276 pages, Kindle Edition

Published August 5, 2019

649 people are currently reading
420 people want to read

About the author

Christine Koth

1 book5 followers

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5 stars
237 (46%)
4 stars
171 (33%)
3 stars
83 (16%)
2 stars
16 (3%)
1 star
3 (<1%)
Displaying 1 - 30 of 50 reviews
35 reviews
March 9, 2021
This book has a lot to offer if you have hip pain. The author describes how chronic pain in a variety of regions can be connected to tightness in the iliacus muscle. Just as the author suggested, I had never heard of this muscle from any of countless health providers I’ve seen: physical therapists, orthopedists, chiropractors, etc. I also found that the author described many aspects of my pain that I’ve never heard articulated by a health professional, e.g., she explained exactly why driving a car is so painful for my hip. I am a skeptic of many sources of health-related info, but I have “bought in” to this author’s idea that the iliacus is important, bought her Hip Hook device, and am hoping she’s on to something! I would have rated this five stars except I felt some of the language was incongruously suited for a middle school reader...sometimes, I wanted just a bit more detail and nuance. Overall, though, a very useful book!

Edited to add update: I've used the Hip Hook now with some regularity since summer 2020. I have less hip pain now than I have had for the past 6 years! The pain decrease could be related to many factors (I am driving less, for example) but you can bet I am not going to stop using the Hip Hook!
Profile Image for Richard Yaker.
7 reviews5 followers
August 2, 2020
Used the hip hook already and feeling relief

3 days so far great results, after first day I bought and read the book. All that goes on with my body makes so much sense now.
864 reviews7 followers
August 15, 2019
I wish I have found this book about a year ago when I spent three or more months suffering from a very painful leg nerve that nothing helped. Excellent book full of good information. Worth you time and money to read if you have unexplained pain. You could probably find an answer and I did.
Profile Image for Kristen Clark.
29 reviews
February 15, 2025
I’m on day 3 of using the hip hook and I can already see some improvements. The book is good explaining problems that cause hip pain. It’s simple language and not a crazy amount of detail but sometimes less is more. Can always go to other sources for continued research. But I’m excited that I’ve seen some positivity with my back and hip. I’m so tired of living with daily pain and some days are just so much worse than others. This has been giving me a light at the tunnel.
150 reviews3 followers
November 9, 2025
it works!

This book was recommended to me by my PT. She immediately knew what was wrong with my lower back. Reqding this book helped me to understand what had happened to my body.
The ball has especially helped me. Thank you.
Profile Image for Amanda.
13 reviews2 followers
January 19, 2025
During my recent training cycle, my hip flexors were so tight that it hurt to sleep on my side. This book (and the ball that I bought with it) have made things so much better!
Profile Image for Lisa.
100 reviews1 follower
September 3, 2021
Makes sense, time for action

I have had chronic SI joint pain and bursitis like pain for a few months now. I have seen a chiropractor several time which gave me temporary relief. At his urging I purchased a roller and have been religiously rolling before bed which has given me a little relief and helped me get a little better sleep. At my wits end yesterday with pain I decided to get out a tennis ball and use that on some hard to reach spots around my hip bone. I also did some tension releasing stretches and finished that off with some heat and anti-inflammatory. I slept like a baby and didn’t walk like Starman when I got out of bed this morning. It was also not painful to go up and down the stairs. Thinking I might be on to something I started googling hip flexor pain and came across this book and some torture looking device to release the psoas muscle. I ordered some larger massage balls and this book. Read the book today and should have the larger balls by tomorrow. Now it’s time to follow the instructions in this book to see if this has been my source of the chronic pain. I’m giving the book four stars because she got straight to the instructions after a little bit of background about these muscle groups. Someone else had complained that the book was just a long advertisement for her hip hook. I didn’t get that impression because she offered two other alternatives, however, if the balls provide some but not all the relief I need I will consider ordering her torture device, the Hip hook, in the future. It would be nice if she would offer purchasers of her book a 20% discount on her torture device because it is quite expensive but when you think about the cost of a therapist, chiropractic adjustment , or massage then it makes sense to purchase the hip hook so you can use it as often as you need. If this works I’ll change my rating to five stars.
Profile Image for Sara.
216 reviews14 followers
April 26, 2020
I've struggled with back/core/pelvic problems for years, including two herniated disc surgeries and working with probably a dozen physical therapists at 4 different clinics. My current struggle is predominantly with left side pain in the hip and groin I am sure was brought on from months of compensating for the severe sciatic pain on the right side that led to surgery last year. While I have been instructed to do some of the exercises in this book before, and other muscles like piriformis have been specifically detailed, NO ONE has ever mentioned the iliacus muscle to me by name (only generic terms like "hip flexor" were used) and no one has ever done manual therapy on my abdomen - only on my back or glutes. All of which is to say this book was eye-opening. The diagrams and descriptions immediately clicked for me (like my hip, which clicks when I rotate it!) and I felt some immediate relief just from laying on my back and manually putting pressure on the iliacus myself. I have only just started this route of self-treatment, and the hip-hook is back-ordered, so I can't speak to long term results yet, but I'm encouraged.
Profile Image for Cody O'Connell.
45 reviews
October 18, 2024
Useful book that helped me understand muscle knots and how tight hip flexors (aka the psoas and illiacus muscle) can lead to all sorts of problems. One of my biggest takeaways is that muscle knots are just localized fibers in parts of the muscle that stay in a contracted state and the way to get them to release is to apply constant pressure for about 30 seconds. I found this quite effective. Additionally, she mentions how stretching knotted muscles is not effective—first you must release them with trigger point massage / constant pressure, then you can stretch. This lines up with my years of experience where stretching did not help my issues. This makes sense now because my muscles are very knotted and must first be released.

I bought the bundle of equipment she sells on her website and use it occasionally and it definitely helps reduce the tension in my back and improve hip flexor range of motion, which is something I struggled with in the past, often injuring my groin/hip flexors on walks. This has mostly solved that and I notice my glutes and low back feel looser and more comfortable after I do this a couple times a week. You can get similar results though from an ~8 lb dumbbell and a tennis ball as described in the book Becoming A Supple Leopard. Although supposedly this only targets the psoas and not the illiacus, as the hip hook she sells is specifically designed to do
Profile Image for Audio Athena.
493 reviews5 followers
March 7, 2023
Non-audiobook review:

The timing of this book was perfect for me. I read this after a month of chronic lower back pain and SI joint instability, interestingly the same month that I was doing extreme daily stretching to try to achieve the front splits (a big no-no in the book). I also was diagnosed with minor scoliosis in high school which included one of my hips being rotated forward due to the spinal curve. All of the symptoms she discusses for a "twisted core" fit me. The drawings of the mangled skeletons with their pelvis and leg turned wrong is what I imagine my x-ray would look like. I can't wait to start her routine and am so glad I read this book. It will be invaluable to me.

I really can't find anything wrong with this book either. It is easy to understand, informative, the drawings help clarify the topics, and you really get a sense that she knows what she's talking about. Her techniques could help just about anyone.

She keeps the patient stories/testimonials to a minimum, which is much appreciated. Beyond the release techniques that use her patented product, the hip hook, she does show a lot of other things: trigger point areas, how to realign the hips, stretches and strengthening exercises, what to avoid, and how to sit better in the car or at work. This is much more than just a 160 page infomercial.
Profile Image for Karma Kimeleon.
478 reviews7 followers
July 15, 2023
I have psoriatic arthritis and I suspect, hypermobility. I have active trigger points almost everywhere I look from them. Yoga/stretching and massage often result in increased pain.
I bought the #fixyourhip kit after 6 weeks with nightmare sciatica. Severe pain, severe limp, and difficulty completing tasks. For example I had to call off work because I could not get my socks and shoes on. I tried numerous medications, heat therapy, steroids, and an increased dose of immunosuppressant with little improvement. While I have had sciatica from a herniated disc in the past, this was coming from my piriformis.
I don’t read much nonfiction anymore but I devoured this book. The pictures of how a tight psoas causes repercussions all the way down to the toes might as well have been my leg. I found immediate relief after session one. Three sessions later I’m 90% better. It honestly feels like miracle. I have no idea why most docs don’t even know about trigger points but I have a feeling they play a huge role in connective tissue disease.
Then I used the Range on my suboccipital trigger points and my tinnitus decreased by half. I’ve had it for at last 15 years. 😭. 5/5 would recommend, just know after thirty seconds of intense pain it starts to decrease. Do not release before 30 secs or it can make things worse (def a mistake I made before this book).
Profile Image for Lisa Rector.
Author 37 books59 followers
December 9, 2020
100% recommended!

This book has been so helpful in shedding light on a serious problem a lot of people probably have. I now feel as if I can do something to attack my hip problem. This book has been very informative, breaking information about the muscles down so that I can understand. I am impressed with the knowledge I learned, not to rub, but to apply pressure to release the tight muscles in the hip. This book is not an ad to buy the hip hook. The hip hook is mentioned is such a small part of the book. I love the humorous aspect of the book, even giving the readers a way to remember how to pronounce iliacus. It rhymes with “silly yak kiss.” Get this book today. Fix your hips now. Even I have 4-inch balls lying around that I can use to apply pressure to my iliacus. I don’t have to invest in the hip hook right now. I can use the ball and the stretches to release and realign my hips. Thank you!
1 review
March 15, 2021
Check this off you chronic pain list!
If you have unexplained chronic back/hip pain, read this book. It will help you understand the basic mechanics of the body and the affects of sitting at a desk all day. Unexplained chronic pain means you have a checklist of things you tried and have yet to try, discover, and experiment with. Make this book something you check off your list and learn about your body without having to put yourself through emotional and financial stress of speaking to countless doctors and endless tests that turn up negative. Give your Iliacus and Psoas a shot!

I am obsessed with the illustrations in this book. So clean and truly complement the reading. I briefly skimmed through and recognized similar images through some searches I've done in the past to try and explain my pain. Not only do the images show you what and where, the text gives you the how and why. I can't wait to continue reading and implementing this book into my life. Thank you!
Profile Image for Claire.
245 reviews5 followers
October 3, 2021
Wow! An amazing book. I would love to give this book to all of my students, clients, family members and friends.

I am a yoga teacher and a massage therapist, and Christine Koth's insight and advice is spot on!

If you've ever wondered why your body hurts and can't seem to figure out what to do to make it better -- READ THIS BOOK!

Fascinating and easy read. Concepts are written in a clear and inviting way. Great resources, images, exercises, and cautionary advice on how our day to day activities may in fact be causing our pain.

Learn about trigger points, refered pain, trauma in the body, as well as how our body is connected (joints, ligaments, connective tissue; basic anatomy, and how the muscles work to support or fight each other in a tug of war).

Hands down, buy this book, or even buy two (to give away)! You will want to share what you learn and experience! 😉
4 reviews
September 23, 2024
Exquisitely Informative Book

I am a physician and I read Ms. Koth's book with a great deal of medical knowledge. All I can say is wow!!! This book is so informative and helpful. I have had a significant reduction in my own hip pain through the release of my Iliacus muscle. She is absolutely right that in many ways unfortunately my profession has become too reactive in treating symptoms rather than root causes. Our sedentary life style is not only the root cause of hip pain but many other physical and mental health issues. Please take care of your Iliacus and all of the other physical and mental aspects of self. If we all just took some time each day for self care big pharma might just have less opportunity to take your money. Thanks Christine for unlocking my hip and reminding me about the best aspects of medicine!
Profile Image for Amber.
31 reviews1 follower
January 29, 2021
For anyone who has had trouble with the iliopsoas, this is the book. I have had psoas and iliacus issues since my late teens (I'm a dancer) and now that I'm older and no longer frequently teaching or moving dynamically (the pandemic has had a lot to do with decrease in activity) I have experienced even more pain and discomfort. Christine Koth, in my opinion, has done a wonderful job in illustrating very clearly and precisely why the iliopsoas can be such a painful and difficult system of muscle to relieve. This book doesn't stop at tension relief and relaxation, but goes further by laying out precisely how to realign and restrengthen the psoas and surrounding muscles. The book has illustrations and anatomical images of muscles and bones. She does provide ample kinesiology and anatomy information throughout the book.
Profile Image for Kelly.
38 reviews11 followers
April 8, 2022
Christine Koth is a godsend. I have had chronic back pain for years. Recently, it has escalated to unbearable levels causing me to miss work and give up activities I love. Nothing I have tried up to this point has helped - not doctors, medications, yoga, stretching, nor physical therapy. As a naturallly flexible yogi, I now see how my hypermobility and lack of stability has wreaked havoc on my iliospoas. This book and her invention the hip hook gave instant relief. I'm following her plan to release my iliospoas, realign my hips, develop better core strength and change my yoga practice once I get back to it. Thanks Christine. You are the real deal. If you have chronic unresolved back, hip, leg, knee or foot pain check out this book and get the hip hook. It might just solve your problems.
88 reviews
January 19, 2021
This book, along with a tool called the Hip Hook, was recommended by a friend as a way to relieve the constant lower back pain I’ve been experiencing. The main idea here is to release a muscle called the iliacus, which, if tight, can cause all sorts of problems in the body. Reading the book, I recognized a lot of the causes and effects described as happening to me. The jury is still out, but after about a week of using the hip hook my back pain is reduced and I am hoping it will soon go away completely. Either way, this book helped me learn more about my hips and other muscles and made me aware of some new techniques and stretches for taking care of my body.
91 reviews
September 4, 2023
Very interesting book and philosophy of the psoas and iliacus contributing to a myriad of problems in our back, hip, groin, hamstrings, feet, etc.

The book is easy to read with good diagrams. She also has some short YouTube videos. I think it is helpful to watch some b4 trying her exercises.

I'm excited to try some of the exercises. I just ordered the hip hook (now called The Mark). My friend recommended this book and had great results.

I'm also going to bring this book to my pt and see if she can do some of the manipulations on me.

Definitely seems worth trying! If it works I'll come back and give it a 5 star rating.
Profile Image for Paige Carter.
6 reviews
May 13, 2025
AMAZING! Easy to read and digest, informative, educational, and instructive. I read this book after purchasing and beginning to use the Hip Hook, and I’m so glad I did. It teaches about how the iliacus and the psoas are the building blocks of the body and can cause referred pain LITERALLY everywhere. The book also includes exercises, stretches, and advice for daily living about how to loosen, strengthen, and keep those muscles and the muscles they impact happy. As a person with chronic back pain, I feel so much hope after reading this book that I am one step closer to getting long-lasting relief!
1 review
May 18, 2025
Game changer

I'm a competitive powerlifter and this book has helped so much. After reading just the first chapter I was able to identify my iliopsoas. Then I immediately ordered a psoas release tool off of Amazon and started laying on it before and after training. Not only is pain now gone, but I can squat deeper. Which this book suggests you avoid. But that's the sport I do, so now I've learned that the least I can do is tend to this muscle group diligently. Now when I get bodywork, we don't spend the whole session on hip release. Great info, everybody who is in sport should know this.
5 reviews
March 10, 2021
Wish I knew this info years ago - maybe I wouldn't have needed my right hip replaced

Oh my gosh it was like you were writing my biography. I sent a link to my PT to some of your info and he needled my illiacus yesterday and some of the villains and all the muscles in my back body and backside finally let go. I had my right hip replaced right before we went into covid lockdown and my hip and quad and tfl are finally relaxing.
Profile Image for K. L..
164 reviews
September 25, 2021
This is written in a way that makes a fairly knowledgeable reader feel like an idiot or child. While there's useful information, you have to sift through the (so to speak) playground sandbox for it. After the first few chapters, I only browsed the rest for info, and didn't fully read...
I suppose I threw a tantrum of sorts, & probably should reconsider reading it in-full for retaining the info, but I don't wanna. Life's too short.
Profile Image for Gregandemy.
1,364 reviews
January 8, 2022
Help me to see why I have a lot of pain in my hips that extends into my legs and back. The book also gives tips on stretches and techniques to use to alleviate tightness and pain. I found some of the illustrations in the book to be difficult to follow. Almost worth more just watching her videos on YouTube for the same information.
1 review
July 22, 2024
Very well written and explained, super easy to read and remember! I did feel like there was a slight aspect of heightened fear of getting your iliopsoas tight from any kind of movement - which I believe is a bit exaggerated and can put people of sports/activities that are really important for their health and wellbeing. Luckily the recommendations for how to take care of your hips were provided and helpful.
Profile Image for Meredith.
266 reviews6 followers
November 2, 2021
While this book didn't share life altering information, the fact that it exists indicates that there are quite a few people dealing with pain similar to my own. It was helpful on refocusing my actions and considering the way forward.
Profile Image for Misty Connella.
3 reviews
December 26, 2021
Must have resource

I love the practical applications, tools, visuals and references. I am a massage therapist and work more and more on hip/back pain. I bought a physical copy to have in the office for reference.
1 review
March 10, 2024
Need to if you hip issues

I went from sliding out of bed to very little pain in one day. This book is extremely helpful with educating you on what you need to do to address your pain.
1 review1 follower
October 23, 2025
Excellent resource

Well written, easy to absorb info:

the author displays a wealth of hands on knowledge gained through experience

and shared with enthusiasm for the better health of all.
71 reviews
August 3, 2020
Got the hiphook

I purchased the hiphook and enjoyed learning more about the muscles that cause pain. I'll probably read this again as I use the device.
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