There's a specific moment that happens in almost every first Pilates class. Someone walks in fresh off a running habit, or years of HIIT, or a gym routine built around progressively heavier weights. They see a room full of people lying on mats, moving slowly, breathing audibly. They assume this will be the easy day.
Then the instructor cues "The Hundred," or a Teaser, or a slow, controlled leg circle — and forty seconds later, that same fit, capable person is trembling, sweating, and quietly reconsidering everything they thought they knew about exercise intensity.
This isn't a coincidence, and it isn't beginner's clumsiness. It's the entire point of the method — and understanding why it happens is the fastest way to actually get good at Pilates, rather than just getting through it.
It Didn't Start as a Workout. It Started as Rehabilitation.
Joseph Pilates developed his method — which he called "Contrology" — in the early 20th century, refining it while working with immobilized patients during World War I, and later publishing his philosophy in Return to Life Through Contrology in 1945. His core belief wasn't about aesthetics or calorie burn. It was that the mind should have complete, deliberate control over the body, and that most people move through life using only a fraction of their actual musculature — compensating with the same overworked muscles for everything, while genuinely important stabilizing muscles go quiet.
That's the first reason Pilates feels different: it isn't designed to let you use your strongest, most obvious muscles to muscle through a movement. It's designed to interrupt that habit.
A Small, Honest Correction Most Content Won't Make
Here's something almost no Pilates article mentions, and it's worth knowing because it changes how you should think about the method: the famous "six principles of Pilates" — Breath, Concentration, Centering, Control, Precision, and Flow — weren't written by Joseph Pilates himself as a numbered list. They were distilled and formalized by two of his students, Gail Eisen and Philip Friedman, in their 1980 book The Pilates Method of Physical and Mental Conditioning — thirteen years after Pilates died. Pilates himself wrote about many of these ideas throughout his work, but the tidy "six principles" framing that gets repeated everywhere is a later synthesis, not a direct quote.
This matters for two reasons. First, it's a small signal of how much Pilates content online is repeated without anyone checking the original source. Second, and more usefully: it means these principles aren't sacred text — they're a genuinely helpful teaching model for something Joseph Pilates was pointing at his whole career. Once you know that, you can hold the principles a little more loosely and focus on what they're actually describing, rather than treating them like commandments.
With that context, here's what each principle is actually doing to your body.
Breath: The One That Changes Everything Else
Most people breathe shallowly, into the chest, especially under any kind of physical stress. Pilates trains a different pattern — often described as lateral or "posterior-lateral" breathing — where the ribcage expands to the sides and back on the inhale while the deep core stays gently engaged throughout. This isn't a wellness flourish. Coordinated breath is how you keep your deep stabilizing muscles switched on while your limbs are moving, which is mechanically much harder than either breathing normally or bracing your core in stillness.
This is also usually the first thing that makes Pilates feel unexpectedly demanding: you're being asked to manage your breath, your alignment, and your movement simultaneously, when most exercise only asks you to manage one or two of those at a time.
Centering: Finding the "Powerhouse"
Pilates referred to the region encompassing the deep abdominals, lower back, hips, and pelvic floor as the "powerhouse" — the idea that essentially all movement should originate from, and be stabilized by, this central region rather than the limbs. This is the physiological ancestor of what's now more commonly called "core strength" in mainstream fitness — though, as we cover in a related article, that phrase gets used far too narrowly today.
A growing body of research supports the idea that Pilates meaningfully engages this region: a 2024 systematic review in BMC Sports Science, Medicine and Rehabilitation examining nine controlled studies found that Pilates-based training produced measurable improvements in postural alignment and spinal-related outcomes, while a companion 2024 systematic review in Archives of Rehabilitation Research and Clinical Translation reached similar conclusions across thirteen studies. Both reviews are appropriately cautious — the included studies varied in quality, and the authors call for more rigorous trials — but the directional evidence is consistent: this isn't just a feeling.
Control and Precision: Why Slow Isn't a Difficulty Setting, It's the Exercise
In most strength training, moving a weight faster (within reason) doesn't necessarily make the exercise harder — often it makes it easier, because momentum starts doing some of the work for you. Pilates removes that shortcut deliberately. Every rep is meant to be executed with total control, at a pace slow enough that no momentum is assisting you, with precise attention to where each part of your body is in space.
The practical effect: your muscles are under continuous tension for far longer per repetition than in most other training styles, with far less opportunity to "rest" between the concentric and eccentric phase of a movement. This is a huge part of why ten slow, controlled leg lifts can be more exhausting than twenty fast ones — you've removed every shortcut your body would normally use to make the tenth rep easier than the first.
Flow: The Principle That Shows Up Off the Mat
Flow is the idea that Pilates exercises should connect into each other smoothly, without dead stops, mirroring the kind of continuous, adaptive movement your body actually needs in daily life — reaching, twisting, catching your balance, carrying something awkward while turning a corner. It's the principle most directly responsible for the "I move differently now" feeling long-term practitioners often describe, because it trains movement transitions, not just isolated positions.
The Enso Loop: A Simple Way to Hold All Six Principles at Once
Trying to consciously think about six separate principles during a workout is overwhelming, and it defeats the purpose. Instead, it helps to think of them as a continuous loop rather than a checklist — which, fittingly, mirrors the meaning behind the word "Enso" itself: a hand-drawn circle in Japanese art representing wholeness, and the beauty of an imperfect, continuous form.
The Enso Loop, in practice:
Breath initiates the movement → Center (the powerhouse) stabilizes it → Control governs its speed → Precision governs its shape → Flow carries it into the next movement → which requires a new Breath to begin again.
You don't need to name each stage while you're moving. But if a Pilates session feels chaotic or rushed, it's almost always because one link in this loop has been skipped — usually breath, which is the one people abandon first under effort.
What Pilates Realistically Does — and Doesn't Do
In the spirit of not overselling this: Pilates is genuinely well-evidenced for improving postural control, core and trunk strength, flexibility, and body awareness. It is not, on its own, a substitute for cardiovascular training — the World Health Organization's 2020 physical activity guidelines still recommend 150–300 minutes of moderate-intensity aerobic activity per week for adults, separate from muscle-strengthening work, and Pilates sits primarily (though not exclusively) in the latter category. It is also not a rapid-fix or corrective therapy for diagnosed medical conditions like scoliosis or chronic pain — the research on Pilates for spinal deformities is described by its own authors as showing "considerable potential" while still needing more rigorous validation. If you're managing a specific injury or diagnosed condition, that's a conversation for a physiotherapist or doctor, with Pilates as a possible complement rather than a replacement.
What it does exceptionally well is teach your body to stop compensating — and that's a genuinely different kind of workout than most people have tried.
Bringing This Into Your Next Session
You don't need to master all six principles at once. If you're newer to the method, pick one per session: spend an entire class simply noticing your breath, then the following session focus purely on control. This is far more useful than trying to look "advanced" by moving faster or adding difficulty before the foundational pattern is in place.
If you're practicing at home without an instructor in the room to correct your form in real time, this is where equipment that gives you physical feedback becomes genuinely useful — not as a shortcut, but as a way to feel precision and control rather than guess at them. A reformer's spring resistance, for instance, gives you continuous feedback on whether you're controlling a movement or letting it control you; guided video instruction fills in for the cueing an instructor would otherwise give you live. That's the specific gap Enso Balance's video-guided Reformer and Prime Kit sessions are built to close — not to make Pilates easier, but to make the principles easier to actually feel without a studio membership.