Home▸Biology & Life▸Exercise Physiology: Energy Systems Lab

🏃 Exercise Physiology: Energy Systems & Training Basics

An accessible look at the body's three energy systems, muscle fibre types, and the training principles that turn effort into measurable fitness gains.

Biology & Life3DModerate60 FPS

A glowing runner draws on three fuel tanks — ATP-PCr, glycolytic, and oxidative — that rise and fall as exercise intensity and duration change, alongside a muscle cross-section showing fast- and slow-twitch fibre recruitment.

🔬 What It Demonstrates

How the three energy systems overlap and hand off to one another over time, why intensity determines which system dominates, and how training raises oxidative capacity and eases fatigue.

🎮 How to Use

Set exercise intensity and training level, then watch the duration clock advance automatically (or drag it yourself) to see the fuel tanks and fibre recruitment respond in real time.

💡 Did You Know?

The ATP-PCr system can resupply ATP almost instantly but only stores enough for a few seconds of maximal effort — which is why a 100m sprinter and a marathoner rely on almost entirely different metabolic machinery.

⚙ Under the hood

A 3D scene showing a runner drawing on three overlapping energy systems (ATP-PCr, glycolytic, oxidative) whose fuel-tank levels and a muscle-fibre cross-section respond live to exercise intensity, duration and simulated training level.

fitnessexercise-physiologynutritionstrength-traininghealthtraining-principles

3D · Three.js / WebGL renderer · 60 FPS target · runs fully client-side, no install