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Fitness Intelligence Platform

Smarter Fitness Starts With Data, Not Guesswork

Calculate your body, optimize performance, and unlock your genetic potential using science-backed fitness tools.

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Free fitness intelligence tools for athletes & beginners.

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BMR
--
kcal/day
VO₂ Max
--
ml/kg/min
Calorie Overview (kcal)
Creatine Daily Dose
--
0 Science Tools
0 % Free to Use
0 Formulas Used
∞ Calculations
Core Platform

Everything you need to understand your body

Four precision tools built on peer-reviewed exercise science — completely free, no login required.

01
🔥
Metabolism
Body Energy Engine
Calculate your Basal Metabolic Rate and Total Daily Energy Expenditure using the industry-standard Mifflin-St Jeor equation.
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02
💨
Cardio
Performance Analyzer
Estimate your VO₂ Max score using the validated Cooper 12-Minute Run Test — a benchmark for cardiovascular fitness.
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03
⚡
Nutrition
Strength Optimizer
Determine your optimal creatine intake based on bodyweight using evidence-based sports nutrition guidelines.
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04
🧬
Genetics
Genetic Potential Engine
Analyze your natural muscle-building ceiling using FFMI-based modeling and lean body mass projections.
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Powered by Peer-Reviewed Exercise Science
🦁

"We built Lion Fitness because we were tired of guessing. Real data should be free and accessible to everyone."

— The Lion Fitness Team

About the Platform

Built for Smarter Fitness, Backed by Science

Lion Fitness Workout is a modern fitness intelligence platform designed to help you understand your body using real data — not guesswork.

Our goal is simple: give athletes, beginners, and fitness enthusiasts access to powerful tools that were once only available to experts — completely free.

  • ✦
    Science-backed calculations: BMR, VO₂ Max, FFMI, and Creatine dosing
  • ✦
    Built for real-world fitness goals — cutting, bulking, performance
  • ✦
    Simple, fast, and accurate — results in under 10 seconds
  • ✦
    No fluff, no gimmicks, no account required — just pure data
Learn More → Try the Tools
TDEE Result
-- kcal
lion-fitness · live results
BMR
--
kcal / day
VO₂ Max
--
ml/kg/min
Creatine
--
per day
Max LBM
--
kg potential
🔥 BMR/TDEE
💨 VO₂ Max
⚡ Creatine
🧬 Muscle
FFMI Score
-- / 25
Interactive Tools

Try the calculators now

Real-time results powered by science-backed formulas. No login. No fluff.

BMR & TDEE Calculator

Uses the Mifflin-St Jeor equation — the most accurate formula for estimating resting metabolic rate.

⚠ Please fill in Age, Height, and Weight before calculating.

🔥

Fill in your details and hit calculate

Basal Metabolic Rate
--
calories per day at complete rest
TDEE (Total Daily Energy) --
Weight Loss Target (−500 kcal) --
Muscle Gain Target (+300 kcal) --
BMRTDEE
Calorie Breakdown

VO₂ Max Calculator

Based on the Cooper 12-Minute Run Test — run as far as possible in 12 minutes and enter the distance.

⚠ Please fill in Distance and Age before calculating.

💨

Enter your 12-min run distance

VO₂ Max Score
--
ml/kg/min — oxygen uptake capacity
Fitness Rating --
Performance Level --
Estimated Pace --
0Elite (75+)
VO₂ Max vs. Population Benchmarks

Creatine Dosage Calculator

Research recommends 0.03g per kg of bodyweight daily for maintenance. Loading phase: 0.3g/kg for 5-7 days.

⚠ Please enter your body weight before calculating.

⚡

Enter your weight to get your optimal dose

Daily Creatine Dose
--
grams per day
Weekly Total --
Monthly Supply Needed --
Protocol --
Min (1g)Max (10g)
Weekly Creatine Schedule

Muscle Potential Calculator

Uses FFMI (Fat-Free Mass Index) modeling to estimate your natural maximum muscle mass based on height.

⚠ Please fill in Height, Weight, and Body Fat % before calculating.

🧬

Discover your genetic muscle ceiling

Max Natural Muscle Mass
--
kg lean body mass potential
Current Lean Mass --
Muscle Gain Remaining --
Current FFMI --
CurrentGenetic Ceiling
Current vs. Potential Lean Mass
Research-Backed

Built on Exercise Science, Not Guesswork

Every formula in our platform is sourced from peer-reviewed research and established scientific methodology.

🧬
Metabolism Science
The Mifflin-St Jeor equation (1990) has been validated in multiple studies as the most accurate BMR predictor for the general population.
Mifflin-St Jeor 1990
🫁
Cardio Performance
VO₂ Max is the gold standard for measuring cardiovascular fitness. The Cooper Test (1968) provides a reliable field estimate.
Cooper Test 1968
💪
Muscle Genetics
FFMI research by Kouri et al. (1995) established that natural athletes rarely exceed an FFMI of 25, providing a reliable ceiling for natural muscle potential.
Kouri et al. 1995
⚗️
Supplement Optimization
Meta-analyses consistently show 0.03g/kg/day creatine monohydrate as the optimal maintenance dose for muscle creatine saturation.
ISSN Position Stand
Learn

Fitness Knowledge Base

Understanding the science behind your numbers makes training more effective.

VO₂ Max (maximal oxygen uptake) is the maximum rate at which your body can consume oxygen during intense exercise. It's measured in ml/kg/min. A higher VO₂ Max means your heart, lungs, and muscles work more efficiently together. Elite endurance athletes typically score 60–80+ ml/kg/min, while the average healthy adult scores 35–50 ml/kg/min.
BMR is the number of calories your body needs to maintain basic life functions at complete rest — breathing, circulation, cell production, and temperature regulation. It accounts for roughly 60-75% of your total daily energy expenditure. The Mifflin-St Jeor formula is the most accurate tool for estimating BMR without laboratory equipment.
FFMI (Fat-Free Mass Index) is calculated as lean body mass divided by height squared (kg/m²). Research on natural athletes shows that without performance-enhancing drugs, the human body rarely achieves an FFMI above 25. Your maximum natural lean mass = 25 × (height in meters)² — adjusted for genetic variation.
Body fat is stored energy, but it plays a crucial role beyond calories. Essential fat (3-5% in men, 10-13% in women) is necessary for hormonal function, organ protection, and vitamin absorption. Reducing excess body fat while preserving muscle mass requires a caloric deficit calculated from your TDEE.

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