Science
Feb 21, 2025
Not All Body Composition Scales are Alike
The BODYSIM Team
Unlocking Peak Potential
Gain muscle and shed fat with prescriptive workouts and meal plans built on your digital twin. BODYSIM combines sensor fusion with metabolism and physiology science to decode the hidden drivers of your body's past performance and future peak potential.
Decode
Uncover hidden metabolic truths with digital twin technology.
Simulate
Visualize your future progress with precision modeling and guidance.
Transform
Reach your peak potential in muscle gain and fat loss with prescriptive workouts and meal plans.
Your Total Toolkit
It’s (much, much) more than an app. The BODYSIM system includes everything you need to learn where you are, where you can go and how to get there.
Withings® Body Scan Scale
Best-in-class body composition scale featuring multifrequency (3), octopolar tech, and WiFi connectivity ($399 value)
Monthly Blood Tests
At-home blood tests with lab analysis to monitor 15+ fitness-specific biomarkers
DEXAFit® Scan
Baseline, gold-standard DEXA scan at a DEXAFit® franchise near you
Quarterly Check-Ins
Follow-up on DEXA scans every three months
Rx Workouts
Personalized plans to rebalance muscles, guide progressive overload, and access to 2,200+ exercises with instructions and videos
Rx Meal Plans
Macro-customized, chef-crafted meal plans with high-protein, low-fat recipes, step-by-step instructions, and in-app add-to-cart capabilities
Escali® Food Scale
State-of-the-art digital food scale for precise measurements and portioning
Body Forecasting
Sophisticated body composition forecasting shows how current plans align with or differ from targeted goals
Responsive Monitoring
Continuous learning of metabolism, physiology, and sensor biases enables adjustments to training and meal plans that evolve with individual progress.
BlenderBottle®
Stainless steel insulated blender bottle (BlenderBottle® Strada)
In-App 3D Scans
A comparable Styku scan is at least $50 each at a Dexafit office!
Triangulating the Truth
BODYSIM decodes your body’s complexities, enabling you to reach your goals.
At BODYSIM’s core is advanced “digital twin” technology, which builds a complete model of your body by integrating a comprehensive set of inputs, including DEXA scans, BIA weigh-ins, 3D scans, fitness trackers, macro-tracking, and blood panel markers. This technology decodes hidden metabolic and physiological metrics—such as Basal Metabolic Rate (BMR), Total Daily Energy Expenditure (TDEE), hormone balance, and body composition changes—to guide you toward your long-term goals with clarity.
Meet Personalized Fitness Insights
By decoding critical data like Total Daily Energy Expenditure (TDEE)—which can shift by up to 450 calories/day over a year—BODYSIM ensures you stay on track and aligned with your long-term progress.
A Plan That Evolves As You Do
As your body evolves, so does your digital twin. It monitors real-time changes in muscle development, fat percentage, and metabolism while forecasting future progress.
Smart Features for Smarter Results
By continuously adjusting your fitness and nutrition strategies to match these changes, it ensures your plans remain uniquely tailored and precisely aligned with your goals.
Feeding Your Simulation
Monthly Blood Panels
Track key biomarkers like hormones and vitamins to optimize your fitness and health progress.
DEXA Scans
Track your progress with initial and quarterly DEXA scans, providing accurate body composition data to monitor progress.
3D Body Scans
Monitor muscle growth and changes with in-app 3D body scans for precise measurements.
TDEE
Track your body’s daily energy needs based on personalized data.
True BMR
Accurately measure your resting calorie needs, factoring in muscle mass and metabolism.
Surveys
In-app surveys track mental and physical signs of overtraining, helping you plan for optimal recovery.
Scale weight & body fat
Build a clearer baseline with directly measured weight and body fat percentage.
Fitness Tracker Data
Seamlessly integrates real time inputs from your existing fitness trackers.
Anthropometrics
Use your base measurements (height, wrist) to inform your frame size.
Food Logging Details
Track all your energy inputs with ease using highly detailed food library and automated preference selection.
Workout Plans
Calculate the value of every exercise and activity in your plan based on its impact to your unique body profile.
Track and Transform
BODYSIM translates inputs into actionable insights. Track rate of muscle gain, intensity trends, and macro consumption to uncover exactly how your choices shape your results.
Pinpoint Progress
Track metrics like muscle gain, fat loss, and energy balance to see how your training intensity, protein intake, and caloric surplus directly influence your body composition outcomes.
Strategize Smarter
Detailed charts forecast month-forward body changes, comparing the outcomes of continuing current trends versus following planned resistance training and macronutrient intake. Identify the adjustments needed to stay aligned with your goals.
Hit Your Targets
Visualize how every refinement impacts progress. BODYSIM forecasts your goal attainment date, optimizing your macros and plan to achieve muscle gain and fat loss results at a sustainable rate that fits into your lifestyle.
How BODYSIM Works
BODYSIM uses sensor fusion to combine your holistic fitness data into a digital twin of your body, accounting for the biases in each data source. This sophisticated mathematical model reveals your true metabolic and physiological state, enabling precise recommendations. Your digital model continuously evolves both as it learns more about you and as you progress along your fitness journey.
RX Workouts
Imagine a personal trainer in your pocket, guiding you on when to increase intensity based on your training history, macronutrient intake, body composition, and potential. Recommendations are synthesized from at-home blood tests, nutritional insights, and mental health monitoring to maximize your gains while avoiding the pitfalls of overtraining syndrome - a leading cause of hindered muscle development.
See Your Current Strength Potential
and understand your “training age”—a measure of your fitness experience and progress—and how it impacts your potential for growth.
Build Your Ideal Physique
through targeting underdeveloped areas, balancing muscle groups, and optimizing strength with precise guidance powered by in-app 3D scans.
Stay on the Fast Track
to strength gains with smart progressive overload that monitors your true 1RM and tells you exactly when to increase weights.
Train at Your Peak
while preventing burnout with Overtraining Syndrome Detection, an integrated system that monitors biomarkers, nutrition, and recovery metrics.
RX Meals
Think of it as a personal nutritionist in your pocket, delivering meal recommendations based on your goals and macronutrient targets. You can prioritize novel or familiar foods, manage meal variety, and ensure macro adherence. BODYSIM Rx Meals streamline meal logging, shopping, and planning by adding ingredients directly to your shopping list and cart, keeping you aligned with your nutrition and performance goals.
Track Your Food
as effortlessly as eating with our smart food logger that combines lightning-fast barcode scanning, millions of food items, and flexible meal building blocks to keep you perfectly on target with your nutrition goals.
Expert-Crafted Meal Plans
guide you to your goals with protein-packed recipes, flexible weekly planning for the whole family, and perfect macros to hit your targets every time.
Skip the Meal Planning
hassel - turn your personalized nutrition plan into perfectly portioned groceries delivered to your door, with step-by-step cooking guidance and the flexibility to mix in your favorite recipes.
The BODYSIM Vision
We’re on a mission to help you learn your body’s peak potential—and then reach it. BODYSIM’s science-based model breaks down your unique metabolism to show you the informed decisions you need to make to achieve your health and fitness goals.
How We Compare
Meal Tracking
| FEATURE | BODYSIM | MyFitnessPal | MacroFactor | Garmin | Fitbod |
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| Core Food Logging | |||||
| Food Database |
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| Barcode Scanner |
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| Custom Foods |
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| Step-by-Step High-Protein Recipes |
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| Dietary Preference Customization |
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| Nested Recipe Integration |
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| Smart Features | |||||
| Personalized Metabolic Modeling |
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| Body Composition Intelligence (knows fat from muscle weight gain/loss) |
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| Macro-Optimized Meal Suggestions |
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| Grocery Integration |
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| Multi-Person Planning |
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| Personalized Nutrition and Macronutrient Balance Optimization |
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Fitness Tracking
| FEATURE | BODYSIM | MyFitnessPal | MacroFactor | Garmin | Fitbod |
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| Workout Planning | |||||
| Exercise Library |
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| Exercise Video Demos in App |
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| Smart Progression and Progressive Overload |
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| Muscle Balance Assessment |
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| Advanced Features | |||||
| Daily Body Composition Assessment with Advanced Error Detection and Recalibration |
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| Overtraining Syndrome Detection |
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| Predictive Muscle Measurements by Training Intensity |
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| Blood Test Integration |
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Be Among the First
$1,599
TO START AND
$239 A MONTH
Everything you need to optimize your fitness, health, and performance is included—no hidden costs, no upsells, and no surprises. This all-inclusive plan ensures you have access to premium tools, personalized insights, and science-backed strategies, so you can focus on achieving your goals with confidence.
¹Qualified means a location we have so designated in our sole discretion. If you are >50 miles from such a location we will attempt to, but expressly do not guarantee we will choose to, qualify a location closer to you. No refunds will be provided for reasons related to distance from a qualified location. Qualified locations include but are not limited to: DEXAFit, BodySpec. Please contact us at support@bodysim.com to inquire about other locations. Quarterly DEXA scans means one scan after each set of three ultimately successful monthly payments. No partial credits or refunds will be provided related to DEXA scans for incomplete sets of fewer than 3 monthly payments.
²Monthly blood tests means one test after each ultimately successful monthly payment.
Refund Policy: The BODYSIM app and its features are provided as a comprehensive system designed to deliver valuable insights and services. While we strive to ensure an optimal experience, occasional maintenance, updates, or data migrations may require limited downtime or re-entry of information. We take all reasonable steps to minimize such occurrences and their impact on your experience. Refunds are not provided for the purchase of the BODYSIM program. The program cost covers essential components, including blood testing consumables, kitchen and bathroom scales, and other physical items. Should any provided hardware experience a manufacturing defect, please contact us for a replacement. Our aim is to ensure you have the tools and support necessary to achieve your fitness and wellness goals. Thank you for choosing BODYSIM.
Subscription to BODYSIM
Includes white-glove service.
Quarterly DEXA Scans
Startup and recurring DEXA scans every 3 months at your local qualified provider¹
annual value$600
Monthly At-home Blood Tests
Monitor hormones, vitamin/mineral levels, macronutrients, and the body's response to training
annual value$2,100
Withings Body Scan BIA scale
value$400
Escali kitchen food scale
value$30
BODYSIM T-Shirt, Blender Bottle, & Heat Pack
Why Trust Us
We built BODYSIM to guide our own fitness journeys. It worked. I put on 45 lbs of muscle, and my co-founder put on 25 lbs of muscle while losing 50 lbs of fat.
Our Tech
This is what we do; our core tech distills messy academic literature into simulations. We've deployed science-based models of consumer behavior and battery electrochemistry to enterprise.
Alpha Outcomes
In our alpha test (ages 29-69, 50% female). 8 alpha testers lost an average of 12.6 pounds in 3 months, and 4 alpha testers with a maintain goal changed <1.4 pounds in 3 months.
Before
After
Before
After
Testimonials
I’ve tried most other fitness apps and they were all giving me different results, so nothing was working. Before BODYSIM, I wasn’t getting anywhere on my own. I needed help.
BODYSIM helped me figure out my actual macros, and just by making those adjustments, I lost 8 pounds in 4 months. That was my goal, to lose half a pound a week.
Stephen
Age 39
Before BODYSIM, I thought I was “in shape,” but using the app and seeing the scans, I saw that much of what I was doing was not actually healthy in the way I thought. I used to work out 4 or 5 times a week and just maintain, not understanding what I do now.
Through BODYSIM, I learned so much more about the food I put in my body and things I didn’t know before. I was very narrow-minded, and the detail provided by BODYSIM really expanded my understanding of what constitutes a plan.
BODYSIM helped me realize what “healthy” is. I think a lot of people don’t really understand macronutrition. BODYSIM helped open my eyes to what I actually need to fuel my body and what’s wrong with a lot of common knowledge about nutrition—it shows you what’s true.
Hilary
Age 35
BODYSIM really helped me manage my hypertension and prediabetes in ways that my GP was very excited about. It not only improved my weight but also my other numbers.
The scans were very informative, and I learned a lot through the process of setting up my goals in BODYSIM—insights I never received from my nutritionist or GP.
Jim
Age 57
Frequently Asked Questions
We are here to help.
For BODYSIM to work as designed, you need to feed the model with specific measurements and data points. To get the full BODYSIM experience, you will need to:
- Describe your frame with initial measurements, like height and wrist circumference.
- Get a DEXA scan at a DEXAFit location to baseline your starting muscle, bone and fat composition.
- Complete our baseline at-home blood test to ensure select hormones, diet markers and vitamins/minerals aren’t holding you back.
- Track your daily macros in the BODYSIM app’s food journal.
- Weigh yourself most days on the provided WiFi body composition scale.
- Let the BODYSIM team help you set a body composition goal, such as to lose 5 pounds of fat and gain 10 pounds of muscle over 4 months.
- Let us help you define a diet and exercise plan describing your daily calories, macros, resistance training and cardio.
- Wear a fitness tracker.
Setting a realistic goal can be hard for two major reasons. First, it’s difficult to set a goal that’s personalized to all the factors of your physiology and metabolism–what’s right for someone else might not be right for your body. Second, there are many different paths to achieving that realistic goal with different levels of pain. Sure, you could lift for 4 hours a day or go on a 1,000-calorie crash diet to get there fast. But is it worth it for you? How high a price are you willing to pay?
BODYSIM learns your unique metabolism and physiology so you can set goals that are realistic for your body. It allows you to simulate how different diet and exercise plans would allow you to reach your goals, so you can pick and dial in a plan that works for your body and your life.
BODYSIM integrates with any fitness tracker that supports Apple Health. This includes Apple Watch, Garmin watches (Venu, Forerunner, Instinct, Epix and Fenix) and trackers (including Vivosmart), Whoop, Oura and Withings watches.
Some BODYSIM users have had difficulty getting Oura rings to track workout heart rates, presumably due to the lack of half ring sizes. We do not recommend purchasing a new Oura ring for BODYSIM unless you already know it is capable of tracking workout heart rates on you. If your Oura ring does track your workout heart rate, it will work with BODYSIM.
BODYSIM does NOT support Fitbit or Google Pixel trackers or watches, as these devices do not integrate with Apple Health.
BODYSIM is an informational tool and is not designed to diagnose or treat any disease. BODYSIM results are for informational purposes only and are not intended to replace or substitute for a physician’s medical judgment or to be relied upon as a professional opinion. No communication from BODYSIM is intended to be or should be construed as medical advice. Always consult your physician or medical professional for any medical advice, decision or actions regarding your health care, or when changing your workouts, supplements or diet.
To learn more about how BODYSIM can help you find your peak potential, contact us at support@bodysim.com.
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