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Skeletal Muscle + Lean Mass
Estimates of total and segmental lean tissue help show how mass is distributed across the arms, legs and trunk and how those estimates change over time.
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Testing & AssessmentsKnow what your weight is made of.
An InBody scan estimates muscle, fat and body water—giving you a more useful baseline than scale weight alone.
The goal is not to chase a single “perfect” number. It is to establish a standardized baseline, match the right Circuit and measure whether your body is changing in the intended direction.
~60 secTypical scan time
SegmentalArms, legs and trunk
No radiationBioelectrical impedance
RepeatableWhen conditions are standardized
What It Is
A fast, noninvasive body-composition estimate.
InBody uses multi-frequency bioelectrical impedance analysis, or BIA. A very low electrical current travels through the body, and the device uses measured impedance with proprietary calculations to estimate body water, lean tissue and fat mass.
The scan is performed while you stand barefoot on the device and hold the hand electrodes. It does not use imaging or ionizing radiation, and the current is generally not felt.
The word “estimate” matters. InBody is useful for establishing and tracking a consistent baseline, but it is not a direct image of muscle or fat and is not a diagnostic medical test.
What It Measures
Move beyond a single number on the scale.
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Body Fat
Estimated body-fat mass and percentage provide more context than weight alone. Depending on the device and report, additional fat-distribution metrics may also be provided.
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Body Water
Estimated total, intracellular and extracellular body water can add context to the result—and also explain why hydration consistency is essential between scans.
Available outputs depend on the specific InBody model and report configuration. No single metric should be interpreted in isolation or used to diagnose a condition.
Why Testing Comes First
Measure before you modify.
A plan built only around weight can miss the change that matters. Losing weight while losing muscle is different from reducing fat while maintaining or building lean mass. InBody adds context that helps us ask better questions and choose more relevant services.
Establish a starting baseline
Distinguish weight from composition
Observe segmental lean-mass estimates
Track fat-mass trends
Identify unexpected changes
Reassess the direction of the plan
Accuracy + LimitationsWhere It Performs Well What Can Shift the Result
Consistency improves the value of the trend.
Practical Longitudinal Tracking
Multi-frequency BIA is fast, noninvasive and repeatable. Studies show strong reliability and support its use for monitoring body-composition estimates when testing conditions and device use remain consistent.
Hydration, Food, Exercise + Temperature
Fluid intake, meals, recent exercise, body temperature and time of day can influence impedance. Absolute estimates may also differ systematically from DXA or multi-compartment laboratory methods.
Track your trend on the same device under similar conditions. A change between poorly standardized scans may reflect testing conditions rather than a true change in tissue.
Your Scan01 · Prepare 02 · Measure 03 · Interpret
What to expect.
Standardize the Conditions
Follow the preparation instructions provided by our team. Testing at a similar time of day, normally hydrated and before exercise improves comparability.
Stand + Hold
Remove shoes and socks, stand on the foot electrodes and hold the hand electrodes with your arms positioned as directed. Remain still while the scan runs.
Review the Result
We review the useful metrics, explain the limitations and identify which findings matter for your goal rather than treating every number as equally important.
How It FitsStep One Step Two Step Three
Measure. Match. Re-measure.
Measure the Baseline
Establish body-composition estimates before making major changes to training, nutrition or your service Circuit.
Match the Strategy
Use the baseline alongside your goals, history and other relevant testing to select the services and behaviors that make sense.
Re-measure the Trend
Repeat under similar conditions at a meaningful interval so the plan can be continued, adjusted or reconsidered using actual data.
EvidenceLongitudinal Comparison Real-World Assessment · 2025 Measurement Conditions · 2023
Useful technology—without pretending it is a direct measurement.
InBody 770 Compared with DXA
In trained adults undergoing a four-week diet intervention, multi-frequency BIA tracked changes in fat mass, fat-free mass and body-fat percentage similarly to DXA, while absolute values differed between methods.
Read the study →Reliable, Moderately Accurate Estimates
A large real-world analysis characterized multi-frequency BIA as reliable and moderately accurate when tightly standardized, while emphasizing the effects of hydration, recent exercise and food intake.
Read the study →Acute Fluid Intake Matters
Research demonstrates that fluid intake before testing can shift BIA-derived estimates, reinforcing why preparation and repeat testing conditions are central to meaningful comparison.
Read the study →Who It May Fit
A baseline for anyone who wants more context than weight.
Members starting a new Circuit
People tracking fat-loss progress
Adults focused on preserving muscle
Athletes monitoring body composition
Members returning after a training change
People ready to retest consistently
Important: People with pacemakers, implanted defibrillators or certain other implanted electronic devices should not undergo InBody testing. Pregnancy and other circumstances may affect suitability or interpretation. Tell our team before testing.
FAQ
Questions answered.
Is an InBody scan the same as a DXA scan?
No. DXA uses low-dose X-rays and is often used as a laboratory or clinical reference method. InBody uses bioelectrical impedance. It is faster and radiation-free, but its absolute estimates can differ from DXA.
How should I prepare?
Follow the instructions supplied by our team. In general, repeat scans are most comparable when performed at the same time of day under similar hydration, food, exercise and temperature conditions.
Can I scan immediately after exercising?
That is not ideal for a standardized comparison. Exercise changes fluid distribution, circulation and skin temperature, which can affect the result. Schedule the assessment before training or after the recommended recovery interval.
Does the scan diagnose visceral fat or sarcopenia?
No. It may provide estimated metrics that contribute context, but it does not independently diagnose visceral-fat-related disease, sarcopenia or another medical condition.
Which number matters most?
There is no universal answer. Muscle, fat and body-water estimates should be interpreted in relation to your goals and trend. For many adults, preserving or building functional lean mass is at least as important as reducing scale weight.
How often should I repeat the scan?
Retesting should occur after enough time for a meaningful change and under comparable conditions. The interval depends on the goal and the plan; more frequent testing is not automatically more useful.
Continue Testing
Build a more complete baseline.
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Estimate resting energy expenditure to add context beyond generic calorie equations.
CategoryExplore Testing
See the assessments used to establish baselines, guide Circuits and measure change.
The First Step
Start Your Upgrade.
Begin with a baseline that tells you more than scale weight. We will help interpret the result and determine what—if anything—it should change in your personalized Circuit.
Start Your Upgrade →InBody provides estimates of body composition using bioelectrical impedance analysis. It is not a diagnostic medical test and is not intended to diagnose, treat, cure or prevent disease. Results are affected by testing conditions, including hydration. Suitability screening is required. Individual results vary.