GLP-1 medications like Ozempic, Wegovy, Mounjaro, and Zepbound have changed what’s possible for weight loss — but the scale doesn’t tell the whole story. A growing body of research shows that a meaningful share of the weight lost on these medications isn’t fat. It’s muscle. If you’re taking a GLP-1 or considering one, understanding that trade-off — and knowing exactly how to protect against it — matters just as much as the number on the scale.
What Is “Ozempic Body,” and Why Does It Happen?
As GLP-1 medications suppress appetite and calorie intake drops sharply, the body pulls energy from wherever it can find it — and that includes muscle tissue, not just fat stores. The rapid, significant weight loss that makes these medications so effective is also what makes muscle loss a real risk. This is where the term “Ozempic body” comes from: the loose skin, flattened curves, and deflated muscle tone that can show up even in people who’ve reached their goal weight.
The Real Numbers Behind GLP-1 Weight Loss
Research published in 2024 found that 25 to 39 percent of total weight lost on GLP-1 medications comes from lean muscle mass — a notably higher share than what’s typically seen when weight is lost through diet changes paired with structured resistance training. In other words, without a deliberate strength-training plan, a meaningful portion of every pound lost on a GLP-1 is muscle you likely want to keep.
Why Muscle Loss Matters More Than the Scale
Muscle is metabolically active tissue — it’s what keeps your resting metabolism from slowing down as you lose weight, and what protects your joints, posture, and balance as you age. Losing muscle instead of fat can mean a body that weighs less but feels weaker, tires faster, and is more prone to injury. It also raises the odds that any weight regained after stopping a GLP-1 comes back as fat, since the muscle that used to burn calories at rest is no longer there to help.
Why Resistance Training Is the Non-Negotiable Partner to GLP-1s
Because of this trade-off, physicians and obesity-medicine researchers increasingly describe resistance training as a required part of GLP-1 treatment — not an optional add-on for people who happen to enjoy the gym.
What Experts Recommend
General guidance from exercise physiologists and GLP-1 researchers calls for a minimum of two full-body strength-training sessions a week, built around compound movements — squats, presses, rows — performed with enough resistance to genuinely challenge the muscle. Alongside training, hitting a higher protein target (often cited around 1.3 to 1.5 grams per kilogram of goal body weight) and prioritizing sleep are considered essential supporting habits for preserving lean mass.
Where Pilates Fits In
Resistance training doesn’t have to mean a barbell and a squat rack. Reformer Pilates, built around spring-based resistance rather than free weights, checks every box experts recommend — full-body, progressive, and repeatable multiple times a week — while being far more approachable for someone newer to structured exercise or managing joint sensitivity.
Why Reformer Pilates Is an Ideal Fit for GLP-1 Patients
Full-Body Resistance Without the Joint Strain
The reformer’s spring system loads the legs, glutes, core, back, and arms in the same session, working against resistance the entire time a muscle is under tension — exactly the kind of stimulus muscle needs to be preserved. Because it’s spring-based rather than gravity-loaded like a barbell, it’s dramatically gentler on the joints, which matters for anyone losing weight quickly, coming back from time away from exercise, or simply newer to strength work.
Built-In Progression as Your Body Changes
One of the real challenges of preserving muscle while your body composition is changing quickly is that your strength needs shift too. Soteria’s four class formats Reform, Restore, Empower, and Strength are built to progress alongside exactly that kind of change, so resistance and intensity can scale up as you get stronger, rather than staying static.
What This Looks Like at Soteria Pilates
Start With an InBody Assessment
Choosing the Right Class Format for You
From there, our team helps you choose between small-group reformer classes, semi-private coaching, or private one-on-one sessions based on where you’re starting from and how much individual attention you want while your body is changing.
Frequently Asked Questions
How many times a week should I do Pilates while on a GLP-1 medication?
Most of our clients on a GLP-1 medication start with two to three reformer sessions a week, which lines up with the frequency researchers recommend for muscle preservation. Your instructor will help adjust that based on your InBody results and how your body responds over time.
Is reformer Pilates enough strength training on its own?
For most people, yes. Reformer Pilates provides genuine full-body resistance training. Pair it with adequate protein intake and consistent sleep, and you’re covering the same fundamentals experts recommend for anyone protecting muscle during weight loss. As always, talk with your prescribing physician about the exercise plan that’s right for you.
Can I start Pilates for the first time while on a GLP-1 medication?
Absolutely — no prior Pilates experience is needed. Many of our clients start exactly here. Our small-group, semi-private, and private formats all let you begin at your own pace, with an instructor adjusting the resistance and movements to where your body is right now.
Getting Started
If you’re taking a GLP-1 medication or thinking about it and want a strength-training plan that actually protects the muscle you have, start with an InBody assessment at Soteria Pilates in Maitland or Winter Garden. Our Soteria Jumpstart package ($119) includes your assessment, a private session, and your first classes, so you can see exactly where you stand before you begin.
This article is for general informational purposes only and is not medical advice. Always consult your physician before starting a new exercise program, especially while taking a prescription medication.