Last updated 06-29-2026
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BODYSIM
BODYSIM is a fitness forecasting system built around a digital twin of your body. Instead of tracking what you did yesterday, it models your metabolism and physiology to predict where your body composition is headed and what it would take to reach a specific goal.
The platform fuses DEXA scans, daily BIA weigh-ins, 3D body scans, fitness tracker data, food logging, and monthly blood panels into one model. That sensor fusion corrects for bias in each data source so estimates of BMR, TDEE, and body composition trends reflect your actual physiology rather than generic formulas.
BODYSIM is built by Well Principled, a team of biologists, mathematicians, and computer scientists who have spent decades translating academic research into software. The product targets people serious about recomposition who want prescriptive workout and meal plans grounded in measured data, not guesswork.
Builds a digital twin from DEXA scans, BIA weigh-ins, 3D scans, blood panels, and fitness tracker data
Forecasts month-forward body composition changes based on your current diet and training trends
Generates prescriptive resistance workouts with 2,200+ exercises and progressive overload guidance
Delivers macro-customized meal plans with barcode scanning and grocery delivery integration
Runs monthly at-home blood tests tracking 15+ fitness-specific biomarkers
Includes a Withings Body Scan scale, Escali food scale, and baseline DEXA scan in the subscription
Integrates with Apple Health-compatible trackers including Apple Watch, Garmin, Whoop, and Oura
Combines multiple measurement types into one metabolic model rather than relying on a single data source.
Subscription bundles hardware, DEXA scans, and blood tests so users do not source each component separately.
Scenario planning lets you compare different diet and exercise paths before committing to a plan.
iOS only with no Android version planned.
No free tier, and subscription pricing is not published on the website.
Requires ongoing data input including daily food logging, regular weigh-ins, and periodic lab work.
Is there a free version of BODYSIM?
No. BODYSIM does not offer a free tier. The product is sold as an annual subscription that includes hardware, lab tests, and DEXA scans.
What does the BODYSIM annual subscription include?
The subscription includes a Withings Body Scan scale, Escali kitchen food scale, baseline DEXA scan at a DEXAFit location, quarterly follow-up DEXA scans, monthly at-home blood tests, the iOS app, personalized diet and exercise plans, body composition forecasting, and email support.
Does BODYSIM work on Android?
No. BODYSIM is available only on Apple iOS devices. The company states there are currently no plans for an Android version.
Which fitness trackers does BODYSIM support?
BODYSIM integrates with any tracker that syncs to Apple Health, including Apple Watch, Garmin watches and trackers, Whoop, Oura, and Withings. Fitbit and Google Pixel devices are not supported because they do not integrate with Apple Health.
Why does BODYSIM require a DEXA scan?
BODYSIM uses DEXA scans as the gold-standard baseline for body composition. The company states that anthropometric calculators, 3D vision scans, and BIA scales can produce large errors compared to DEXA, which would undermine the metabolic model.
Is BODYSIM a medical device?
BODYSIM is an informational tool and is not designed to diagnose or treat disease. Results are for informational purposes only and are not a substitute for medical advice. Users are advised to consult a physician before changing workouts, supplements, or diet.