What Is a Reformer Pilates Machine & How Does It Work?

What Is a Reformer Pilates Machine & How Does It Work? A Complete Guide

Everything you need to know before your first session — from someone who teaches on one every day.

If you’ve ever been curious about reformer Pilates — or scrolled past a video of someone gliding across a sleek machine and thought, what is that? — you’re not alone. “What is a reformer Pilates machine, how does it work?” is one of the most common questions I hear from people in Salt Lake City, Draper, and across the Wasatch Front who are thinking about trying something new for their bodies. I get it. The machine looks beautiful. It also looks a little intimidating. But here’s the truth: the reformer was designed to meet you exactly where you are. And once you understand how it works, the intimidation melts away. It’s just you, springs, and movement.

What Is a Reformer Pilates Machine, Exactly?

A reformer Pilates machine is a bed-like frame with a flat, cushioned platform — called the carriage — that rolls back and forth on rails. Attached to one end of the frame are springs of varying resistance. At the other end sits a footbar. Overhead, there’s a set of loops and straps connected to ropes and pulleys.

That’s it. Frame. Carriage. Springs. Straps. Footbar. Joseph Pilates invented this apparatus in the 1920s, originally calling it the “Universal Reformer” because he believed it could reform the body. Nearly a century later, his design remains remarkably similar — and remarkably effective.

Modern reformers — like the ones we use at my studio in Utah — are precision-engineered with quiet glide tracks, adjustable spring tensions, and padded shoulder blocks for safety and comfort. Whether you’re recovering from an injury or training for a half-marathon through the Cottonwood canyons, the reformer adapts to you.

How Does a Reformer Pilates Machine Work? The Mechanics Explained

The magic of the reformer is in the springs. Unlike dumbbells or weight machines that rely on gravity alone, the reformer creates variable, constant resistance through spring tension. You push or pull against the springs, and they push or pull right back.

Here’s what that means in practice:

• The carriage moves. When you press your feet against the footbar or pull on the straps, the carriage glides along the rails. You’re controlling the movement — the reformer doesn’t move on its own.
• Springs create resistance. Each spring has a color or weight rating. More springs = more resistance (and more support). Fewer springs = less resistance (but more instability and core demand). It’s counterintuitive, but lighter spring work is often harder.
• Straps and ropes engage the upper body. Arm work, leg circles, and coordination exercises happen through the ropes and pulleys attached to the carriage.
• The footbar adjusts. Different heights allow for different exercises — from leg presses to standing balance work.
• Shoulder blocks keep you stable. They prevent you from sliding off the carriage during exercises like the Hundred or Long Stretch.

What I love about the reformer — and what I see transform my clients — is this: every movement requires you to control the carriage. You can’t cheat. You can’t use momentum the way you might with a barbell. The spring tension demands that you stabilize, lengthen, and engage your deep core muscles throughout the entire range of motion. That’s where the change happens.

Reformer Pilates vs. Mat Pilates: What’s the Difference?

I get asked this constantly. Both are Pilates. Both work. But they feel very different.

I love mat work — I trained in it for years. But the reformer gives my clients something the mat can’t: instant tactile feedback. The carriage moving underneath you tells your body when you’re drifting out of alignment. It’s like having a second instructor. That’s why I recommend reformer work for beginners especially. If you’re considering your first visit, my beginner’s guide to your first reformer class walks through exactly what to expect.

What Muscles Does the Reformer Target?

All of them. Honestly.

The reformer is a full-body resistance training system. In a single 50-minute class at Alchemize, we typically move through exercises that target:

• Deep core stabilizers — the transverse abdominis, pelvic floor, and multifidus that most gym exercises miss
• Glutes and hip stabilizers — essential for runners, hikers, and anyone sitting at a desk in Lehi or Utah County all day
• Quads, hamstrings, and calves — through footwork, lunges, and leg press variations
• Back extensors and spinal muscles — pulling straps, back extension, and swan prep
• Shoulders, arms, and chest — arm circles, chest expansion, and long stretch series
• Inner thighs and adductors — often neglected, always sore after reformer day

The difference is how these muscles are worked. Reformer Pilates emphasizes eccentric loading — controlling the lengthening phase of a movement. That’s what builds long, functional strength without bulk. It’s also what makes the work so effective for injury prevention and rehabilitation.

Who Is the Reformer Good For? (More People Than You Think)

In my studio, I work with a wide range of people. I’ve taught postpartum moms from Sandy who haven’t moved in months. I’ve taught high school athletes from Park City who need shoulder stability for ski season. I’ve taught retirees from Draper who were told by their physical therapists to try Pilates. Every single one of them works on the reformer.

The reformer is especially good for:

• Complete beginners — the machine guides your movement, reducing the chance of injury
• People with back pain or joint issues — spring resistance is low-impact and adjustable
• Prenatal and postpartum bodies — gentle, supported strengthening for the pelvic floor and core
• Athletes cross-training — improved mobility, balance, and muscular endurance
• Anyone who feels stuck — physically, mentally, or both

I won’t pretend the reformer is the only tool that works. Strength training, yoga, swimming — there are many paths to a healthy body. But if you’re looking for something that meets you where you are and challenges you to move with more intention, the reformer is exceptional. Check out our class schedule to see what we offer for different levels and goals.

What to Expect in Your First Reformer Session

Your first time on the reformer should feel guided, supported, and maybe a little wobbly. That’s normal. Here’s what happens:

1. You’ll learn the basics. How to adjust springs, where to place your feet, how to hold the straps. I never throw clients into complex choreography on day one.
2. You’ll start with foundational movements. Footwork (think leg presses), bridging, and simple arm work. These teach you how the carriage responds to your body.
3. You’ll feel muscles you didn’t know you had. Not pain — awareness. The reformer finds your imbalances quickly.
4. You’ll leave wanting to come back. Not because I’m a genius marketer, but because the work feels good. Different from other workouts. Quieter. Deeper.

If you’re in the Salt Lake City area or along the Wasatch Front and you’re ready to try, you can book your first class here. I keep class sizes small so I can actually see you and adjust your form — that matters more than any fancy equipment.

Why I Chose the Reformer as My Primary Teaching Tool

I didn’t always teach on the reformer. I started on the mat. I loved it. But when I began my comprehensive Pilates certification — which included training on all the classical apparatus — the reformer changed everything for me. It was the first time I understood why Joseph Pilates built what he built. The springs don’t just add resistance. They add honesty. They reveal where you’re strong, where you’re compensating, and where your body needs attention.

That’s what I wanted to build Alchemize Pilates around: honest, precise, deeply felt movement. Not a workout that leaves you wrecked. A practice that leaves you reformed — in the truest sense of the word.

When you understand what a reformer Pilates machine is and how it works, the mystery dissolves. What’s left is something simple and powerful: a machine designed to help you move better, feel better, and reconnect with a body that’s been waiting for your attention.

— Bianca

Bianca — Founder & Lead Instructor, Alchemize Pilates

Bianca is a comprehensively trained Pilates instructor and the founder of Alchemize Pilates, a boutique reformer studio based in Utah. She specializes in helping beginners, postpartum women, and athletes discover precise, intentional movement on the reformer. When she’s not teaching, she’s hiking the Wasatch Front or researching the biomechanics behind why this century-old method still works.