The Fitny Journal

Expert analysis, scientific protocols, and deep-dives into the mechanics of health engineering.

All Articles BMI Guides Workout Science Nutrition

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Calculator Science

BMR vs. RMR: The Scientific Distinction Every Athlete Should Know

While often used interchangeably, Basal Metabolic Rate and Resting Metabolic Rate have distinct clinical definitions. Understand the variance and which one you should use for your macro calculations.

By Dr. James Aris • 8 min read

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Metabolism

Mifflin-St Jeor vs. Harris-Benedict: Which Equation Wins?

A statistical breakdown of metabolic equation accuracy across different age groups and activity levels. Why we chose Mifflin-St Jeor as our default engine.

By Sarah Chen, RD • 12 min read

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Workout Science

The Neural Drive: How Your Brain Controls Hypertrophy

Exploring the neuromuscular junction and how central nervous system fatigue impacts your volume calculations and recovery timelines.

By Marcus Thorne • 15 min read