COREX12 Foundations
“12 Exercises to Fix Your Entire Body”
We believe most injuries are caused by 12 common muscle weaknesses & imbalances that are almost always neglected by the top PT’s and trainers. Fix those, and you fix the root cause of the injury – not just the symptoms.
The 12 Foundation Exercises Target:
- Legs & Hips (5 exercises)
- Shoulders (4 exercises)
- Core (3 exercises)
- Bonus: Wrist, Neck, and Foot exercises
Feel it to Heal it – Method
The key to our system and testing is eliminating compensations during each exercise so that you feel only the target muscle weakness working. If you mostly feel other muscles taking over, the true weakness won’t strengthen – and the injury won’t heal. Learn our Method>>
Fully rehab recurring injuries
Bullet proof & protect you from potential injury
Realign your body & improve posture
Maximize flexibility potential
Prepare you for future training
Web-based App (Not in App Store)
The rehab program is accessed on our website. It works just like an app on your phone, or you can use it on your computer or tablet.
Important Program Details
3-Phase Rehab System
Our COREX12 rehab approach is built on a progressive 3-phase system designed to move clients from injury rehab into general fitness & lifting. READ MORE >>
PHASE 1 – 12 Foundations
In Phase 1, our comprehensive videos and exercise testing guide allows you to locate and activate the correct target muscle weakness during all 12 exercises — without compensations. If you mostly feel other muscles taking over, the true weakness won’t strengthen, and the injury will not heal.
That’s why mastering technique with lighter weight is crucial in this phase. It helps you build a strong mind–muscle connection to the weak area before progressing to Phase 2. This foundation is the core of the CoreXcell “Feel It to Heal It” Method >>.
PHASE 2: Advancements
Once a client passes all 12 tests in Phase 1, they move into Phase 2. In this phase, the original 12 foundational corrective exercises are replaced with more advanced versions that target the same muscles – but at more challenging angles with greater weight and intensity to fully fix the weaknesses – causing the injury. We also begin introducing basic lifting movements to prepare you for Phase 3.
PHASE 3: Corrective Lifting
In Phase 3, we combine the advanced corrective exercises from Phase 2 with a foundational lifting program. This phase can be scaled up or down depending on your lifting experience and training background.
Once you pass Phase 3, you’ll have the option to progress into one of our advanced programs below:
See Longevity Lifting >>
See Sports Training >>
Testing & Injury Modifications
The programs can be customized for your injury using our testing and specific injury guide. READ MORE >>
Specific Injury Guide: We include a detailed injury guide. Simply search for your specific injury, and we’ll show you how to modify the program based on your needs.
Muscle Testing Protocol
Each exercise includes a simple muscle testing video to ensure you’re doing it right. You’ll learn how to:
- Check if the target muscle is activating correctly
- Modify exercise based on where you feel compensations & pain
- Know when you’re ready to return to training or sport
Passing 3-Phase Testing: Each of the three phases includes specific testing guidelines to help you determine when you’re ready to move from one phase to next.
Purchase Rehab App
Includes
- Rehab APP on website (Not in APP store)
- COREX12 – 3 Phase Rehab System
- 6 months of access (NO recurring payments)
- Access on Phone, Tablet, or Desktop
- Testing Guide to Modify Program Based on Injury
Privates with Zach
Virtual or In-Person
Private Session Packages
Real Results from Real People
Posted onTrustindex verifies that the original source of the review is Google. I am not an athlete, but a musician in my in my mid 60s – probably not Zach’s typical client. I’ve spent a lifetime of being hunched over a piano and in later years, a computer keyboard. About 9 months ago, I started having pain in my right shoulder, and it hurt even to lift my arm straight out to my side. I came across a video of Zach working with a pitcher who had injured his shoulder, and his approach really made sense to me. I was encouraged, both by the thought of getting relief from the pain, and the idea that I could have a professional trainer give me guidance to establish an effective full body workout that would allow me to continue to be active. I decided to purchase the six video package, and I’ve been working with Zach for 3 months now. It’s often the case that we are more quick to notice when something hurts than when it doesn’t hurt, and two weeks ago, I helped my daughter and husband move into a new house, and I realized, my shoulder does not hurt at all! This works, and I’m still in the first level of exercises. I can see that this has tons of potential, and I am very excited to see my further growth. Even with just working those underlying muscles and building a foundation, I already notice that I carry myself differently. I’d also recommend doing the video sessions which I have found to be invaluable. Not only is there a learning curve, but as the muscles develop, there are adjusts that are required to continue to get the maximum benefit. I have appreciated being able to go back and review the sessions to watch what I did and to hear his instruction, which is very precise. I then use Zoom to video myself during my work out, so I can compare it side-by-side to what I did during the session. Great program, and Zach really knows what he is doing!!Posted onTrustindex verifies that the original source of the review is Google. I have been having calls with Zach for my shoulder since March, the improvement in my shoulder pain is dramatic. I have gone from daily pain and struggling to get any sort of comfort while trying to sleep, to now having no daily pain and great sleep. I have gone through each of his steps and are now starting on the corrective lifting phase which is amazing progress for me. Like many others for years I struggled with my shoulder and had no real answers from any other physician, apart from exercises that didn't work and aggregated the problem or from a surgeon saying I could have surgery. Luckily I came across Zach's YouTube channel whilst doing my own research, his approach seemed like a perfect fit for me, I put it off for around 6 months but finally signed up and I'm glad I did. The App he offers has been a great help in showing you how to do the exercises correctly and keeping me on track as to what to do. This as well as the zoom calls pushes you in the right direction and can easily point out any mistakes you are making ( I was making allot of mistakes to start with) I look forward to working further with Zach in the future.Posted onTrustindex verifies that the original source of the review is Google. After over a decade of visiting various physical therapy specialists for a persistent shoulder injury, I had almost given up hope. Multiple imaging studies showed "nothing wrong," yet the pain and dysfunction kept returning despite temporary improvements from other providers. The cycle of brief relief followed by setbacks was incredibly frustrating. From my very first appointment at Corexcell, Zach immediately recognized what others had missed. Not only did he quickly identify the root cause of my issue, but he also provided a clear, realistic timeline for recovery - and he was spot-on with his assessment. What sets Zach apart is his commitment to excellence. While other therapists were satisfied with "good enough" form during rehab exercises, Zach demanded perfection. This attention to detail made all the difference. His meticulous approach is exactly why I believe I'm finally experiencing true, lasting relief for the first time in over 12 years. Beyond his exceptional clinical skills, Zach is genuinely a pleasure to work with. He's knowledgeable, personable, and makes each session enjoyable with great conversation. If you're looking for a physical therapist who will get to the root of your problem and provide long-term solutions rather than temporary fixes, I cannot recommend Zach and Corexcell highly enough. After years of disappointment elsewhere, this is where real healing happens.Posted onTrustindex verifies that the original source of the review is Google. Finally a program that works. Can't say enough good things. Had shoulder issues for years after my car accidents. Many years of rehab through chiropractor, message therapists, various band and strength training didn't do the job. Would get moderate improvements. But I never thought I'd be able to get back on the bench and push the weights I am now. Push ups were just not possible. Lower back pain and stiffness that occurred mainly from walking, GONE! Building muscle in my sixties and losing weight. Wish I had discovered this a few years back. Very grateful for the program you have developed. You clearly know what your doing.Posted onTrustindex verifies that the original source of the review is Google. I sought Zach's help because I developed probably a shoulder impingement causing arm pain from doing exercises incorrectly for months and also slipped and fell on ice possibly tearing something. I began watching various physical therapist on YouTube to see how I could improve my shoulder. There was something different about Zach compared to most others. He seemed very confident and enthused about what he was teaching and unlike others he has plenty of client testimonials. When I first contacted Zach I had limited mobility with my right arm. I experience pain when raising my arm above my shoulder or extending my arms straight out in any direction and had to move the arm slowly to control it. I began working with Zack through zoom meetings and following his protocol of exercises. After working with Zack for about 6 months I now have almost as much range of motion as the other arm and quickly with very little pain. At this point I think what pain I experience is at the end of the range and that's probably because I've not been able to get my arm in those positions for several months and the muscles just need to be stretched out. The human body is a very complex designed machine. Zach seems to have a good knack for understanding which muscles need to be strengthened in order to overcome pain, lack of mobility, and improve posture. If you're willing to put in the effort of performing the exercises regularly that he's designed over a time of weeks or months then I highly recommend hiring him.Posted onTrustindex verifies that the original source of the review is Google. Do you have joint aches and pains? I did before meeting with Zach. Hip bursitis. Patellar tendonitis, a bakers cyst, pulled hamstring, knee pain, turf toe. Many issues. 6 months ago I was unable to get out of bed without knee pain. After working via video call with Zach for a series of months, I can walk/ jog lightly PAIN FREE. He gave and me and can give you hope! I am looking forward to working with Zach for the foreseeable future and cannot thank him enough. 10/10 recommend. Go CoreExcell!Posted onTrustindex verifies that the original source of the review is Google. I’ve been doing online calls with Zach for the past few months. When i started i was in other words hopeless as i injured my shoulder 5 years ago (19 years old) with no progress over the years of trying every kind of treatment i could afford. Now i’m 24 and after about 4-6 months of working with Zach and I just benched pressed for the first time in half a decade without pain in my shoulder. I could understand where you’re coming from when you think online calls wouldn’t suffice for fixing a serious injury… but this review is proof that the program and zoom calls work. all you need is dedication and patience!Posted onTrustindex verifies that the original source of the review is Google. My name is Randy Calentine I am 63 years old and an avid pickleball player. Within the last year I had to stop playing due to bone-on-bone knee arthritis and rotator cuff problems with both shoulders. 3 months ago, I started working with Zach and the Corex12 Rehab online program and have obtained great results with my knees and shoulders by strengthening the supporting muscles and I am back playing pickleball regularly 3 times a week. My overall fitness has improved as well as my level of play. I am looking forward to continuing the program as I am confident that more gains and improvements are on the way Special thanks to Zach and his Corex12 Rehab ProgramPosted onTrustindex verifies that the original source of the review is Google. I am really grateful for Zach's help. I've been suffering from bad knee pain for one and a half years. I had patellofemoral pain and a lot of clicking and popping in the knee. It was a struggle to walk for more than 5 minutes at once. After going to multiple physical therapists with not much improvement I found the CoreXCell YouTube channel and immediately bought the rehab program. After trying for some time I realized the exercises were too difficult to learn on my own, so I purchased the video sessions. Now after only two months of working together my knee feels much better and stronger. I could even start to do squats with weight. All of the sessions happened through video calls and it worked perfectly. I highly recommend Zach and his rehab program to anyone who is suffering from an injury.
FAQ
No, it’s not in the App Store. The program is purchased on our website. The Rehab App is designed for your phone, and it also works great on a laptop or desktop – so you can view exercises on a larger screen for easier learning.
Most traditional programs have clients perform exercises without realizing they’re reinforcing compensations — not the true weak link — so the root cause never gets fixed. Many assume that training a certain plane or range of motion will automatically target the right muscle. That’s where most systems fail.
Our success comes from:
- Precise muscle activation: If you can’t locate and feel the exact weak muscle working, you won’t fix the injury.
- Built-in testing: Every exercise includes testing to confirm you’re activating the true weakness (not compensations).
- Personalized start/end points: Multi-level positions help you start at the right range of motion for your body, so you feel the correct target muscle during all 12 exercises.
Learn about the Feel It to Heal It Method>>
This system is technical and requires focus — it’s not for everyone. You’ll need to place yourself in the correct positions and build a strong mind–muscle connection so compensations don’t take over. If you’re up for the challenge, these exercises can be life-changing and get you out of pain.
Using a mirror:
Clients who get the best results use a mirror and a laptop. Watch the exercise technique in the app and use the mirror (or your laptop camera) to match positioning in real time.
Privates with Zach:
The fastest path to success is private sessions with Zach — they remove the guesswork.
- Shoulders: 2x per week
- Legs & Hips: 2x per week
- Volume: 3–4 sets of 15–20 reps per exercise
- Session length: 45–60 minutes
This may not seem like much, but when you’re training the true weakness (not compensations), your body needs adequate recovery to adapt. Doing too much volume too soon often sets you back and increases irritation.
Do I need to do all 12 exercises?
We recommend completing all 12 exercises to protect yourself from future injuries in both your upper and lower body. The entire body is interconnected — fixing an upper-body issue often benefits from lower-body stability, and fixing a lower-body issue benefits from upper-body balance.
Training for a specific injury:
If you just want to focus on the shoulder exercises to fix your shoulder (and skip lower body), that’s fine. Or if you only want the hip and leg program for a lower-body injury (and skip upper body), that works as well.
For the best long-term results, we encourage running the full system when possible.
The programs are designed to be customized based on your specific injury using our built-in testing and injury guide.
Specific Injury Guide
We include a detailed injury guide inside the app. Simply search for your condition, and we’ll show you exactly how to modify the program — including which exercises to emphasize, which to modify or skip temporarily, and how to progress safely.
Muscle Testing Protocol
Every exercise includes a simple muscle-testing video to ensure you’re activating the correct muscle. You’ll learn how to:
- Check if the target muscle is firing correctly
- Modify the exercise if you feel compensations or pain
- Know when you’re ready to progress or return to training/sport
The important thing to understand is that we always use the same 12 foundational exercises in our system. The customization comes from teaching you the exact range of motion where you feel the target muscle the most — and how to adjust that range as you improve.
Testing at Every Phase
Each of the three phases includes specific testing guidelines to help you determine when you’re ready to move forward and get fully out of pain.
If you’re consistently hitting the target weakness (with no compensations), you should notice significant pain relief by around 2 months—sleep and daily activities typically feel better with much less irritation.
Note: If you don’t feel relief after 2 months, book privates with Zach — he’ll get you on track.
Long-Term Fix – Back to Training (estimates include the initial 2 months):
- Leg, Hip, Foot injuries: 3–5 months
- Low Back / SI Joint Pain: 3–5 months
- Low Back Herniations: 6–9 months
- Shoulder, Elbow, Wrist Pain: 3–5 months total
- Shoulder Tears: 6–9 months total
Yes. About 80% of your app purchase is credited toward Zach’s 2- or 6-session private packages.
Email Zach to schedule>>
