Reformer Pilates: What It Is and What It Does

Almost everyone walks into their first class believing the reformer “tones” or “sculpts” the body. Neither word means anything physiologically, and both sell extremely well.

The machine is simpler than its reputation suggests: a carriage that slides on rails, with springs you can set heavier or lighter. That’s it. And from that simple mechanics comes everything it can actually do for you, which is still plenty.

What the reformer is actually made of

A reformer is a frame with a carriage — the part where you lie, sit, or stand — that slides on rails. The carriage connects to a fixed headrest through a system of springs. Those springs are the resistance: hook more springs and the movement gets heavier; hook fewer and it gets lighter.

There are also straps for hands and feet, a footbar to push against, and shoulder rests or a headrest depending on the exercise. With that combination of sliding carriage, springs, and points of contact, the same machine allows for literally hundreds of different exercises, just by changing position, spring tension, and angle.

That’s the whole machine. There’s no electronics, no secret toning technology, nothing that does something to your body that a spring and gravity can’t explain.

What it’s actually good for

The reformer is a resistance-training tool, with two features that set it apart from a dumbbell or a standard gym machine.

Resistance can assist, not just oppose. A spring can help you complete a movement you couldn’t do with your own body weight, or it can push back and make it harder. That gives a much wider range of difficulty than lifting a fixed weight.

The load changes with position, not just with which spring you hook. The same spring feels different lying down, sitting, or standing, because the angle and the lever arm change. That’s part of why a well-trained instructor matters: they know which combination of spring and position matches your level.

What it trains, at bottom, is the same thing any well-dosed resistance exercise trains: strength, muscular endurance, motor control, and stability. It doesn’t “tone” in the sense that no physiological mechanism exists that’s separate from gaining strength or muscular endurance. Muscle adapts by getting stronger or more fatigue-resistant; there’s no in-between “tone” state that a machine switches on. And it doesn’t lengthen muscle either: a muscle’s length is determined largely by where it attaches to bone, not by a type of workout.

Why even the science can’t agree on what pilates is

Here’s something worth knowing before you compare studies, because it explains why a “pilates” class at one place can feel so different from another.

A team of researchers (Wells, Kolt, and Bialocerkowski, 2012, Complementary Therapies in Medicine) reviewed 119 scientific articles describing pilates to see whether a consistent definition existed. They found consensus on the broad description: a mind-body exercise centered on strength, core stability, flexibility, muscular control, posture, and breathing, done on a mat or with equipment.

But when they dug into the detail, they found something more telling: the six classical principles of the original method (centering, concentration, control, precision, flow, and breathing) were mentioned, on average, in only 23% of those 119 studies. And in the back-pain studies specifically, they barely showed up at all, except for breathing.

In plain terms: the word “pilates” gets used for fairly different things, even within the scientific literature. That’s one more reason to judge a study — or a pilates class, lowercase p — by what actually happens in the room, not by the label on the door.

Source: Defining Pilates exercise: A systematic review — Wells, Kolt & Bialocerkowski, 2012

What the evidence says about results

The strongest evidence that exists for pilates (reformer included) is for low back pain. The Cochrane review (Yamato and colleagues, 2015), which analyzed ten trials with 510 participants, found that pilates is probably more effective than doing nothing for reducing pain and disability in the short term, with low-to-moderate quality evidence. Compared with other types of exercise, there’s no evidence it’s superior.

Outside of back pain, the reasonable move is to lean on what we already know about resistance training in general: it improves strength, muscular endurance, and motor control when practiced regularly (ACSM’s Guidelines for Exercise Testing and Prescription, 11th edition). The reformer doesn’t have its own exclusive benefit category; it falls under what well-dosed resistance training is already known to do.

What sets it apart from the mat and from gym machines

Compared with the mat, the key difference is the spring: on the floor, your only load is your own body weight, so you can’t dial it down. On the reformer, you can. That makes it a better entry point for someone who can’t fully support their own weight yet. If you’re already deciding between the two, there’s a full article on reformer vs. mat that covers that in depth. We won’t repeat it here.

Compared with a stack-weight gym machine, the difference is that a spring doesn’t have a flat resistance curve: it changes with angle, speed, and where your body sits on the carriage. That demands more motor control and stability than pulling a cable in a straight line, even when the weight “feels” similar.

What a reformer class at Naü is like

At Naü, a reformer pilates class runs 50 minutes, in a small group inside one of the studio’s 4 rooms at Plaza Muray. Coaches cue in English, so the language barrier isn’t an issue if you’re visiting or just settling into Cancún. The pricing package is the same across all 10 disciplines at the studio, so you can try reformer without buying anything exclusive to it: single classes start at $93 MXN and the monthly Unlimited plan is $2,300 MXN.

If you’ve never taken one, the trial class ($199 MXN) is the most direct way to feel the difference between reading about the reformer and actually getting on one.

FAQ

Does the reformer help you lose weight?

It helps the way any regular resistance training helps: it burns energy and builds muscle. It’s not a specialized tool for fat loss above and beyond other well-dosed exercise.

Do I need prior experience to take a reformer class?

No. The springs let you lower the load more than the floor does, so it’s usually a good entry point even without prior experience in resistance exercise.

Is it the same as mat pilates?

They share principles, but not the tool: mat uses your body weight as the only resistance; reformer uses adjustable springs. Here we compare both in depth.

How many times a week should I take reformer?

It depends on your goal, but there’s an evidence-based answer. We cover it in this article.

How long is a class and how much does it cost?

50 minutes, in a small group. Single classes start at $93 MXN and the monthly Unlimited plan is $2,300 MXN, the same package that covers all 10 disciplines at the studio.

---

Figuring out which class suits you best takes about a minute with the class finder tool. And if you’re ready to start, here’s the schedule at Plaza Muray — with parking on site, just minutes from Puerto Cancún, Malecón Américas, and the Zona Hotelera.