The physical changes that come with perimenopause aren’t an argument for doing less. They’re an argument for doing the right things more intentionally.
What actually changes in perimenopause
Perimenopause, the years leading up to the final menstrual period, which can span anywhere from two to ten years, is a period of significant hormonal shift. Estrogen and progesterone levels fluctuate and gradually decline, and those hormonal changes have direct physical consequences that go well beyond the symptoms most commonly discussed.
The two that matter most for long-term physical health, and that are most directly addressed by exercise:
- Bone density loss. Estrogen plays a significant role in bone metabolism, specifically in the activity of osteoclasts, the cells that break down bone tissue. As estrogen declines, bone resorption accelerates. The years immediately before and after menopause are when bone density loss is fastest, and the losses during this period compound over the following decades. Osteoporosis isn’t an old-age disease; it’s a midlife process that creates old-age consequences.
- Muscle mass loss. Sarcopenia, the gradual loss of muscle tissue with age, begins in the mid-30s, but accelerates significantly during the hormonal shifts of perimenopause. Estrogen has anabolic effects on muscle tissue; as it declines, maintaining and building muscle requires more deliberate effort than it did at 30 or 35.
Both of these processes are influenced significantly by exercise. Not all exercise is equal; specific types of movement have specific effects on bone and muscle, and the specificity matters.
What the research says about bone density and exercise
The evidence on exercise and bone density is consistent and has been accumulating for decades: mechanical loading is the most effective non-pharmacological intervention for maintaining and building bone mass.
Mechanical loading means putting the skeleton under load, weight-bearing activity where the body must resist or produce force. This stimulates osteoblasts, the cells that build new bone tissue, and signals the body to maintain bone density in the loaded areas.
Not all exercise produces this stimulus equally:
- Progressive resistance training, lifting weights with progressively increasing load, is the most well-evidenced form of exercise for bone density maintenance and improvement, particularly in the spine and hip, the two sites where osteoporotic fractures are most consequential
- High-impact activity (jumping, running) also loads bone effectively, but is less accessible for women managing joint pain, which is common during perimenopause
- Low-impact cardiovascular exercise (cycling, swimming) does very little for bone density; these modalities are valuable for cardiovascular health but don’t provide meaningful skeletal loading
- Reformer Pilates, through spring resistance and bodyweight loading, provides moderate mechanical stimulus, more than swimming, less than heavy barbell work
The implication: women in perimenopause who want to protect bone density need progressive resistance training as part of their exercise program. Pilates alone is not sufficient, though it contributes and provides a foundation that makes strength training safer and more effective.
What the research says about muscle preservation after 45
Muscle loss during perimenopause is not inevitable in the sense that it cannot be influenced; it can be. But the intervention required is more specific than general activity.
Progressive resistance training is again the most evidence-backed tool. Resistance exercise provides the mechanical stimulus that signals muscle protein synthesis, and when combined with adequate protein intake, it can maintain and even build muscle mass during a period when the hormonal environment makes this harder.
What doesn’t work as well as most people expect:
- Cardio-dominant exercise programs — effective for cardiovascular health, caloric expenditure, and mood, but don’t provide the anabolic stimulus needed to counter sarcopenia
- Pilates-only programs — spring resistance builds functional strength and stabilizer activation, but the load ceiling limits the hypertrophic stimulus. Valuable as a foundation; insufficient as the only intervention for muscle preservation
- Low-calorie approaches without resistance training — weight loss through caloric restriction without resistance exercise tends to accelerate lean mass loss, which worsens body composition even as the scale moves
The pattern that works: progressive resistance training as the primary driver of muscle preservation, Pilates for movement quality and deep stabilizer function, and adequate protein intake to support muscle protein synthesis.
Where reformer pilates fits in the picture
Reformer pilates isn’t the whole answer to perimenopause-related physical changes. But it’s an important part of it, and it does specific things that conventional strength training doesn’t.
The spring resistance system of the reformer creates a unique training stimulus: variable resistance that challenges muscles through their full range of motion while providing joint support. This is particularly valuable for women in perimenopause for several reasons:
- Joint pain is common during perimenopause, particularly in the hips, knees, and lower back. The reformer’s spring-assisted movement reduces impact and allows training through ranges that can be painful with free weights
- Pelvic floor changes, also driven by estrogen decline, respond well to the breath-and-core integration that’s central to Pilates instruction. This isn’t incidental; it’s specific and significant
- The deep stabilizer focus of Pilates addresses the hip and spinal stability that tends to decline with age and hormonal change, and that conventional gym training systematically misses
- Body awareness developed through Pilates translates directly to safer strength training; knowing how to engage your core before adding load is what separates productive barbell training from the kind that produces back injuries
In practical terms: women in perimenopause who combine reformer Pilates with progressive strength training get the movement quality and deep stabilizer work from Pilates and the bone density and muscle preservation stimulus from strength training. Neither alone achieves both.
What this looks like at Soteria Maitland
The clients we work with at Soteria Maitland skew toward exactly this demographic: women in their 40s, 50s, and 60s who are serious about their physical health and want to understand what they’re doing and why, not just follow a class schedule.
The three-pillar program we launched in June, Pilates, Strength, and Recovery, is built for this. The Pilates sessions provide the joint-friendly movement quality and deep stabilizer work. The strength sessions provide the progressive resistance load for bone density and muscle preservation. The recovery component- mobility, breathwork, programmed deload- supports the adaptation from both.
What separates Soteria from other studios: you don’t start with a class. Every new client begins with a new client special that is built entirely around understanding your body before we ask anything of it. That includes a private one-on-one session with your instructor, an InBody 380 body composition scan, which gives us your exact muscle mass, body fat percentage, and metabolic baseline, and a movement assessment that identifies your limitations, injury history, and where your body is compensating.
For women navigating perimenopause, this matters more than it might at another stage of life. The InBody scan gives us a concrete baseline: your current muscle mass, your bone mass estimate, your visceral fat level. That’s not data you’re going to get from a free trial class at another studio. It’s the difference between a program built around what your body actually needs right now and a generic class you slot into.
While other studios offer a free class or a week of drop-ins, we give you answers. Why you’re losing bone density and muscle mass. Why you’re in chronic back pain. What your body needs specifically, and a program built around that. That’s what the new client special is for, and it’s where the three-pillar program starts for every client who walks through our door.
If you’re on a GLP-1 medication, Ozempic, Wegovy, Mounjaro, Zepbound, or another, the lean mass preservation concern is directly relevant here too. We covered the intersection of GLP-1 medications and Pilates in a recent post; the short version is that the strength pillar of our program addresses exactly the muscle preservation gap that GLP-1s create.
The honest case for starting sooner rather than later
Bone density loss that occurs in the years around menopause is difficult to reverse later. It’s much easier to maintain bone density during the transition than to rebuild it afterward. The same is true of muscle mass: the anabolic response to resistance training declines with age, which means the returns on the same training effort are higher at 47 than at 67.
This isn’t a scare tactic. It’s the honest version of what the research shows: the perimenopause years are a high-leverage window for building the physical resilience that determines how the next two to three decades feel. The decisions made during this period, about exercise, about strength training, about what modalities to include, have a longer tail than the same decisions made at 35 or at 65.
If you’re in that window and you’ve been doing Pilates without a strength component, or lifting without the movement quality work that Pilates provides, October is a reasonable time to look at what’s missing.
The new client special is where that conversation starts. A private session, an InBody 380 composition scan, and a movement assessment- so your first session gives you actual answers, not just a workout. We’re in Maitland and see clients from across the Orlando area.