DexaFit Seattle

☀️🏃‍♀️🧊🧖‍♂️ SUMMER SATURDAYS AT ALKI BEACH

Join us for Run. Plunge. Sauna. — a monthly morning of movement and recovery, hosted with , , and .

📍 Alki Beach
📅 June 27 | July 25 | August 22
⏰ 9AM

The format: a casual 5K run or walk, a cold plunge in the Sound, and a sauna session to close things out.

Run/walk is free. Sauna access is $20 (that's $15 off the usual rate).

Link to sign up is in the 1st comment

Tag a friend who'd love a morning like this. Link in bio to register.

𝗧𝘄𝗼 𝗽𝗼𝘂𝗻𝗱𝘀.

That's approximately where the research draws the line on visceral fat — the threshold above which cardiometabolic risk climbs measurably, independent of your total body fat percentage or how lean you appear.

Visceral fat wraps around your internal organs, sits deep in the abdominal cavity, and is highly metabolically active. Research published in Circulation established it as an independent predictor of cardiovascular disease, type 2 diabetes, and metabolic syndrome — even in people whose total body fat falls within normal ranges. A person can carry meaningful visceral fat volume while looking completely lean in the mirror. Their scale reads nothing useful. Their BMI says nothing at all.

The only accurate non-invasive way to measure visceral fat volume is imaging — and of the available options, DEXA is the clinical standard that's actually accessible outside a hospital. It separates visceral fat from all other tissue, gives you a precise number in pounds, and puts it in context against population norms.

Most health snapshots don't include this number. Which means most people are managing their metabolic risk without the variable most likely to drive disease over the next decade.

By the time your doctor orders your first bone density scan, you've had roughly 30 years of decline with no baseline.

Standard guidelines recommend that first scan at 65. Peak bone mass occurs in your late 20s to early 30s. The math on that gap is not complicated.

After peak, bone responds to the demands placed on it. Load-bearing exercise, adequate protein, and the right nutritional inputs can slow the decline. Reduce those inputs, and the skeleton adapts accordingly — in the wrong direction.

Worth noting: osteoporosis has long been framed as a women's issue. That framing is outdated. Approximately 2 million men in the US currently have osteoporosis, with another 16 million carrying low bone mass and elevated fracture risk. One in four men over 50 will experience an osteoporosis-related fracture in their lifetime. The suspected driver is exactly what you'd predict — more sedentary childhoods, fewer hours of load-bearing physical activity across the lifespan, more years spent at a desk. Bone responds to mechanical demand. Two generations of systematically reduced demand are producing the results you'd expect.

The stakes are specific: low bone mineral density increases fracture risk, alters joint loading mechanics, and compounds the lean mass losses that drive structural decline over time. Bone that has been neglected for decades takes years to meaningfully change. The window for intervention is not infinite.

A DEXA scan measures bone mineral density directly, at the same clinical sites used in osteoporosis screening. Establishing that baseline in your 30s or 40s gives you something to work from. Waiting until 65 gives you documentation of what has already happened.

The research community has spent the last ten years reclassifying muscle as a longevity organ. The fitness industry hasn't caught up yet.

Lean muscle mass now ranks among the strongest predictors of all-cause mortality in the literature, outperforming BMI as a health indicator at virtually every age. The mechanism is direct: muscle regulates glucose metabolism, supports joint integrity, generates the bone loading stimulus that keeps skeletal density from declining, and provides the reserve capacity that determines whether aging becomes frailty or stays functional.

The condition of losing it is called sarcopenia. It begins earlier than most people expect, accelerates through the 40s and 50s without deliberate intervention, and is almost never screened for until it has already become a clinical problem.

The clinical test that measures lean mass precisely is a DEXA scan — direct measurement by region, with bilateral breakdown included. No estimates, no proxies.

If you have not established a lean mass baseline, you are managing one of the most consequential health variables entirely blind.

Book your DEXA scan: Seattle.DexaFit.com

Four ways people measure body composition. Here's what each one is actually doing.

The scale measures the gravitational pull on your total mass. That's the complete list of what it does.

BMI divides your weight by your height squared. A formula invented in 1832 by a Belgian mathematician studying population averages. He was explicit that it should never be applied to individuals. It cannot distinguish a 200-pound athlete from a 200-pound person with dangerous visceral fat load. Both score identical.

Bioelectrical impedance (BIA) sends a low-level electrical current through your body and estimates fat percentage based on how fast it travels. The problem is that current speed changes with hydration, meal timing, recent exercise, skin temperature, and electrode placement. Drink a liter of water before the test — your body fat drops. Skip breakfast — it shifts the other direction.

Research published in the Journal of Strength and Conditioning Research found BIA error rates ranging from 8 to 10 percentage points compared to DEXA in trained populations. Consumer devices like InBody and Tanita operate on the same principle with the same fundamental limitations.
You are not measuring body composition. You are measuring conductivity and running it through an equation built on population averages that may have nothing to do with your actual physiology.

DEXA uses low-dose X-ray to directly measure tissue density. Fat mass, lean mass, and bone are separated at the physics level — not estimated through a proxy signal. Lean mass is mapped by region: left arm, right arm, trunk, both legs. Visceral fat volume is calculated independently from subcutaneous fat. Bone mineral density is assessed by skeletal site. Bilateral asymmetry is visible in the data. This is why DEXA is the clinical research standard against which every other method gets validated.

The other three tools estimate. DEXA measures. That gap is the difference between managing your body on assumption versus managing it on data.

Book your DEXA scan

Two people. Same weight, same height, same BMI.

One carries dense bone and high lean mass with minimal visceral fat. The other carries the same total weight but with significant visceral fat and lean tissue that's been quietly declining for years.

Their health trajectories over the next decade are not the same. Standard medical evaluation cannot tell them apart.

A DEXA scan can.

Here's what it actually reads: fat mass and lean mass are measured separately. Lean mass is mapped by region — left arm, right arm, trunk, both legs — so bilateral asymmetry shows up in the data. Bone mineral density is assessed across key skeletal sites. Visceral fat volume is calculated independently from total body fat.

Ten minutes on a table. A complete structural blueprint. Every number tells a different story about where your body is headed.

Your scale gives you one number. Your annual physical gives you a ratio. Neither one reads the structural chapter.

Book your DEXA scan: Seattle.dexafit.com

Your annual physical is designed to catch disease. Not to prevent it, optimize it, or find the thing that's been quietly draining you for a decade.

That's a different set of numbers entirely. Here's what those look like.

BMI was invented in 1832 by a Belgian mathematician. He was studying population statistics, not individual health. He said so himself.

Your annual physical still runs it.

Adolphe Quetelet built that formula to describe averages across large groups. He was explicit that it should never be applied to a single person's body. Nearly two centuries later, it's the centerpiece of most health screenings in the country.

Here's what the number actually captures: how much you weigh relative to your height. That's the entire calculation. Muscle, fat, bone density, visceral fat load, lean mass decline since your last visit — none of it registers. A 200-pound athlete and a 200-pound sedentary adult with dangerous organ fat can produce identical BMI scores.

A DEXA scan reads what BMI ignores. It separates fat mass, lean tissue, and bone into precise measurements. It maps bilateral symmetry. It quantifies the visceral fat surrounding your organs — the kind that drives inflammation, insulin resistance, and metabolic dysfunction long before anything shows up in standard bloodwork.

You deserve an actual assessment. Book your DEXA scan at [location URL].

June built the metabolic layer of the Longevity Engine™. What started with a single unfamiliar term — resting RER — became a three-level framework that reads your fuel system from the floor up.

Most people entered this month knowing their caloric floor. What they didn't have was a read on what their engine was actually burning, whether it could switch fuels under load, or which of its cylinders was the primary constraint on the output they were chasing.

The Fuel Gauge™ answers all three. And now that the metabolic cylinder is on the map alongside the structural and cardiovascular data, the complete diagnostic picture is within reach.

Here's everything June covered — and where the work goes next. 🧵

Six-week transformation challenges have their place. DexaFit is built for something different — knowing exactly which cylinder of your physiology has been limiting your output, named with data and not estimated with a formula.

Four weeks of the Fuel Gauge™ this month. Three levels of metabolic data. One framework for reading what your engine is actually doing.

The Decoder takes all of it — your DEXA results, your VO₂ Max report, your RMR and resting RER — and produces a single prioritized Engine Report. Which cylinder is your primary constraint. What the mechanism is. What the programming priority is. Specific to your data.

The early access list is open now. The people on it get first access when The Decoder goes live.

Comment to get on the list