HomeLaunchesBODYSIM by Well Principled
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BODYSIM: Gain muscle and shed fat with a digital twin of your body

Your body's app-based simulation that recommends nutrition and exercise to meet your goals.

We're excited to announce a complete overhaul of BODYSIM from a tracking and modeling tool for your metabolism into an end-to-end fitness forecasting system. After launching our initial beta last fall, we discovered something crucial: our users didn't just need another tracking tool with cool graphs, they needed a complete solution that bridges the gap between goals and real results.

The Challenge of Getting Results is Still Valid

If you've ever tried to build muscle and lose fat, you know the frustration:

  • Conflicting advice from countless "experts" and unreliable information
  • Scattered data across different apps and devices, each telling a different story
  • The exhausting task of turning abstract targets into actual meals and workouts

The (new) BODYSIM Solution: Building Your Digital Twin

At BODYSIM's core is our advanced "digital twin" technology, combining sensor fusion with the science of metabolism and physiology to help you understand your true potential, using:

  • DEXA scans
  • BIA weigh-ins
  • 3D body scans
  • Fitness tracker data
  • Resistance training
  • Macro-tracking
  • Blood panel biomarkers

This comprehensive data integration unlocks hidden insights about your metabolism, including your Basal Metabolic Rate (BMR), Total Daily Energy Expenditure (TDEE), hormone balance, and body composition changes.

What's New: Tools are Not Enough - Get Our Users Outcomes

1. Prescriptive Meal Plans: Chef-Created Meal Plans & Virtual Meal Kits

  • Library of high-protein, low-fat recipes with step-by-step instructions to make eating for transformation easy
  • Customizable weekly meal plans based on your preferences and goals
  • Direct integration with Walmart and Amazon delivery: order your entire meal plan with a few clicks
  • Simplified food logging with grouping, automated recipe creation, and easy to repeat meals

2. Prescriptive Workouts: Comprehensive Workout System

  • 2,200+ exercises with detailed videos and instructions
  • Intelligent weekly split recommendations
  • Progressive overload tracking to optimize muscle gain
  • 3D scan integration to track individual muscle group progress

3. Fitness Forecasting: Advanced Integration Features

  • Scenario planning to understand how to achieve goals faster
  • Muscle group modeling that maps exercises to specific body measurements
  • Blood marker sub-models that connect nutrition choices to health outcomes with quantitative recommendations to make a change
  • Overtraining Syndrome (OTS) risk monitoring



Why Trust Us

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. 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.

And it worked 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.

We then had some beta amazing beta tester results: one lost 40 lbs, another gained 12 lbs of muscle, a female user gained 8 lbs muscle, a co-founder gained 10 lbs of muscle, and more.

The Complete Package

Your BODYSIM subscription includes:

  • Quarterly DEXA scans
  • Withings Body Scan scale
  • Monthly at-home blood tests
  • Escali food scale for precise tracking
  • Daily body composition updates
  • Live signals like Resistance Training Intensity to adaptively steer to your goals
  • Personalized exercise and nutrition recommendations

Join Us

Join us in revolutionizing how people transform their bodies. With BODYSIM, you're not just getting another fitness app - you're getting a science-based, personalized system that guides you from where you are to where you want to be.

Ready to transform your body with confidence? Visit bodysim.com today.