The Gratz Reformer: Why Craftsmanship, Original Dimensions, and Fidelity to Contrology Are Non-Negotiable
Written by: Kerlly Castellano Crespo
I thought I knew Pilates.
I had been a dancer practicing Pilates since my early teens. Movement was my language, my discipline, my identity — and Pilates Mat work had been woven into that identity for years. I was strong, coordinated, and deeply familiar with the principles. I had done the work. Or so I believed.
Then I walked into Endurance Pilates in Boston and, under the guidance of Julie Erickson, stepped onto a Gratz Reformer for the first time.
I was humbled the moment I pressed off that footbar. What I thought I knew about my body — after years of dancing, training, and mat work — quietly rearranged itself. Moving that carriage the way it demanded — not driven by the legs, not muscled through — asked me for something I did not yet know how to give. It was an awakening, and I realized in that first class that I would be pursuing it for the rest of my life.
The smooth upholstery, the solid weight of the carriage, the sturdy handles: everything felt precise — like something was reorganizing my bones from the inside out. Everything clicked into place that class. The spring resistance, the geometry of the footbar, the angle of the headrest: it all added up to something my Mat practice had only been pointing toward.
Once you have felt what the work is actually supposed to feel like, there is no going back. Every other apparatus becomes a reminder of what is missing. That is not a preference — it is a standard.
A Foundation Built Through Classical Pilates
That day I opened Pandora's box of Classical Pilates and it has yet to be sealed. What follows is my best attempt to put into words what I believe this work — and this apparatus — deserves.
I did not arrive at Classical Pilates casually. By the time I walked into Endurance Pilates in Boston, I had already spent the better part of my life inside rigorous movement disciplines — gymnastics at a national level in Ecuador, years of ballet and modern dance, salsa, cheerleading. My body knew how to work. What it did not yet know was how to be truly organized.
That changed under the direction of Julie Erickson — a demanding but also deeply knowledgeable teacher who herself studied with Brooke Siler. From 2015 to 2017 I completed my comprehensive instructor training at Endurance Pilates, a program that dismantled and rebuilt my understanding of movement from the ground up. I continue to deepen my practice learning from 2nd and 3rd generation teachers, and alongside all of this, I am a Certified Anesthesiologist Assistant — my understanding of the body is not only experiential. It is anatomical, physiological, and clinical.
When I say the Gratz Reformer is the best apparatus for this work, I say it from that accumulated depth. Not from preference. From feeling.
What the Gratz Reformer Actually Does — and Why It Matters
The Gratz Reformer is a full-body conditioning apparatus built on a principle of eccentric and concentric muscular control through spring-loaded resistance. It challenges the deep stabilizers — the powerhouse, in Classical language, which includes the abdominals, obliques, multifidus, spinal extensors, inner thighs, hips, and pelvic floor, working in concert as a unified system of support — while simultaneously demanding length, articulation, and awareness in the extremities. The leather straps are where that conversation reaches its furthest point: looped around the hands or feet, they become an extension of the body itself, the place where the powerhouse finally speaks through the limbs and the whole form finds its full expression.
But the Gratz Reformer does something beyond the mechanical. Because its dimensions are original, every exercise in the Classical repertoire is supported and challenged the way it was created. The footbar height places the feet in the exact relationship to the hips necessary to tap into that powerhouse and create the connection the work depends on. The length of the carriage gives the spine room to fully articulate — to lengthen, flex, and achieve that thoracic extension we are all after, as in Semi Circle. The spring resistance challenges and aids at the same time, depending on how they are used — a quality that is entirely intentional, and entirely dependent on the correct apparatus.
When you practice on a Gratz Reformer, you are not approximating Contrology. You are doing it.
Original Classical Pilates Dimensions: Why They Cannot Be Improvised
Here is what many practitioners do not realize until they have trained on Gratz: when the dimensions change, the exercise changes. A Reformer with risers alters the demand of the arm-to-back connection necessary to drive the carriage — as in an exercise like the Hundred, where that connection is everything. A footbar set at a different height changes hip mechanics in Footwork and Stomach Massage. A spring system with different tension profiles changes the eccentric demand on the muscles entirely.
Think of it the way Roger Federer felt about his racket — not just any racket, but the specific weight, balance, and string tension he had spent years calibrating to the exact demands of his game. Hand him a different one and he is still Roger Federer, still the greatest to ever hold a racket, but something is lost in translation. The instrument no longer meets him where he is. The same is true for a great golfer and his clubs — the lie angle, the shaft flex, the grip: details that to an outsider seem negligible, but to the player represent the difference between their best game and something lesser.
For those of us trained on Classical apparatus, stepping onto a non-classical Reformer carries that same sense of displacement. It is a completely different apparatus — one that does not speak the same language, does not ask the same questions of the body, and cannot deliver the same answers.
One detail worth understanding is the mobile footbar. In Classical Contrology, transitions between exercises are not rest breaks. They are part of the work — moments of coordination, control, and continuous engagement. A footbar that adjusts fluidly preserves the rhythm and flow of the session. Studios using fixed or cumbersome footbars unknowingly fragment the very continuity the method depends on.
They are the difference between doing the work or not. Simply put.
Gratz Craftsmanship: Aluminum, Wood, and the Refusal to Cut Corners
Gratz Pilates builds with aluminum frames, solid maple wood, and hand-crafted components — not for aesthetics, but for structural integrity. The frame does not flex under load. The wood does not warp with use. The springs hold their feel over years of practice. Many studios still work on Gratz apparatus from the 1970s and 1980s in full, uncompromised condition. That is what refusing to cut corners looks like over time.
The difference is felt immediately — and I have seen that recognition on a client's face firsthand. Not long ago, a new client walked into Body Contrology Lab: a New Yorker who splits her time between the city and Jupiter. She had practiced Classical Pilates for years, knew Gratz by feel, and had spent her first Florida season quietly appalled — moving from studio to studio, finding only plastic reformers that bore no resemblance to what she knew the work to be.
When she walked in and saw the full studio — Reformers, Cadillac, High Chair, Ladder Barrel, all Gratz — she stopped in the doorway. She said it was the first time since leaving New York that she felt she had found a real classical studio. Body Contrology Lab is the only fully equipped Classical Pilates studio in Jupiter, and that recognition meant everything — because it confirmed exactly why this standard matters.
Why Choose Gratz Pilates Equipment
A Gratz Reformer purchased today will still be fully functional in 30 years if you use proper care and upkeep. Many less expensive apparatus require significant repair or replacement within a decade. When you consider the lifespan of the equipment alongside the value of practicing correctly — without compensations built into the apparatus itself — the investment becomes clear. Quality at this level does not expire.
There is also a common misconception that if an exercise feels challenging, the apparatus must be working. But challenging is not the same as correct. You can make any exercise feel hard with the wrong setup — you will simply be training the wrong muscles, reinforcing the wrong patterns, and missing the progressive method Joseph Pilates created. The difficulty is not the point. Where the difficulty lands is the point, and original dimensions are what ensure it lands where it was meant to.
And for those who have trained on other apparatus for years and wonder whether it is worth making the change — every instructor who has made that transition says the same thing. The first session on a Gratz Reformer is a revelation. Exercises that felt settled suddenly reveal new depth. The body finds positions it had been quietly searching for. It is not a lateral move. It is an arrival.
The more I continue to study Contrology, the clearer it becomes: the apparatus is not supplemental to the method. It is the method. Joseph Pilates designed his exercises in direct relationship to his equipment — the Reformer, the Cadillac, the Wunda Chair are not interchangeable platforms for delivering exercise concepts. The resistance, the geometry, the feedback of the apparatus are what make the exercises what they are.
My clients trust me with their bodies. Some come with injuries, histories, complex movement patterns built over decades. Some are athletes pushing toward higher performance. Some are discovering this work for the first time. What they all share is that they are investing — their time, their focus, their physical selves — in something they believe will make them better. That investment deserves the best possible environment to work in. Not an approximation. Not a reformer that looks similar. The real thing, built to the exact standards the method was created around.
Providing anything less would be a quiet form of dishonesty I am not willing to accept. The Gratz apparatus is not a preference or an upgrade. It is a standard — and my clients deserve nothing short of it.
Favorite Exercises on the Gratz Reformer
The Classical repertoire comes alive on a Gratz in a way that is difficult to describe until you have felt it. A few exercises that say it best:
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Footwork — The foundation of every session. Like laying the foundation of a house, everything built on top of it depends on how well it is done. The footbar height and spring tension demand that the legs, hips, and powerhouse find their proper relationship before anything else is asked of them.
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First Long Box: Swan and Breaststroke — Advanced exercises rarely taught, and only to students at that level of readiness. But for the right body, at the right time, they are transformative. In an era of chronic forward rounding — hours at screens, the spine perpetually collapsing inward — Breaststroke in particular wakes up the entire back of the body in a way almost nothing else can. It reminds the body what it feels like to truly extend.
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Long Back Stretch — The push-through on the reverse is humbling every time. This is an exercise that reveals what you actually have — and builds what you do not yet.
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Tendon Stretch — The gymnast in me lives for this one, one-leg especially. The body cannot compensate its way through it. One of the most revealing exercises in the repertoire.
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Semi Circle — A masterclass in spinal articulation. The carriage dimensions of the Gratz allow the full range without cutting it short — the descent, the press, the thoracic extension we are all after.
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Russian Splits — Advanced work that demands everything: flexibility, stability, trust, and an apparatus that can hold the geometry without compromise. It is one of those exercises that makes you grateful for the right equipment.
On a Gratz, the apparatus holds you and demands of you in equal measure — and that balance is the whole point.
The Correct Pilates Equipment for the Correct Work
Joseph Pilates called his method Contrology for a reason. It is a system of control — precise, demanding, and complete. To practice it correctly, you need the equipment he designed it around, built to the standards he established.
The Gratz Reformer is that equipment. Its original dimensions, handcrafted construction, and unbroken lineage to the founder's own tradition make it not merely the best available option, but the appropriate apparatus for practitioners serious about Contrology.
If you are teaching Pilates — or practicing it — you deserve to know what the work actually feels like on the apparatus it was made for. The Gratz Reformer is an investment in your practice, your students, and the integrity of the method itself.
About the Author
Movement has been my first language for as long as I can remember. I competed with the Ecuadorean National Gymnastics Team, spent years training and performing in ballet and modern dance, and danced salsa at Boston University. Pilates found me inside all of that, and it never let go. Where every other discipline demanded more from the body, Contrology gave me the tools to sustain it.
In 2015, I began my comprehensive instructor training at Endurance Pilates in Boston under the direction of Julie Erickson — a rigorous program that dismantled and rebuilt my understanding of movement from the ground up. I became a 4th-generation classical instructor in the Romana lineage in 2017 and remain committed to ongoing study, continuing to learn from 2nd and 3rd generation teachers.
Alongside my movement career, I am a Certified Anesthesiologist Assistant. That medical foundation deepens everything I do as an instructor — my understanding of anatomy, physiology, and biomechanics is not theoretical. It is clinical. It is especially meaningful when clients arrive with complex histories: prenatal and postnatal concerns, disc herniations, joint replacements, or post-surgical recovery.
When I moved to Jupiter, FL and found no fully equipped classical studio offering the complete system on authentic apparatus, I built one. That vision became Body Contrology Lab — the only fully equipped classical Pilates studio in Jupiter, featuring an exclusively Gratz apparatus collection and dedicated entirely to teaching the authentic method. My mission is to educate the Jupiter community about what Pilates actually is: the original method, practiced on the original apparatus, taught in an unbroken lineage from the source.
I specialize in working with athletes and dancers who want to improve performance, prevent injuries, and cross-train to restore balance and biomechanical integrity — and with anyone ready to discover what this method can genuinely do for them.
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