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FORM ACADEMY / COURSE 02

How training works.
Seen from the inside.

Watch the muscles fire through a stride and a pedal stroke. Zoom into a fibre, follow the fuel, and build a training block. Five interactive lessons for runners, riders and triathletes.

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Anatomical runner with the working muscles lit

THE COURSE

From muscle to training block.

Every lesson is interactive,
and every number is sourced.

HOW TRAINING WORKS

Progress is saved on this device

Show it for
01

12 MIN

Muscles in motion

An anatomical 3D runner and rider, with every major leg muscle lighting up when it works.

02

12 MIN

Why running costs more

Working while stretched, 2.5 body weights per step, and tissues that adapt slower than your engine.

03

10 MIN

Inside the muscle fibre

Slow and fast fibres, how they are recruited, and what weeks of easy training build inside them.

04

10 MIN

Fuel and intensity

Fat, carbohydrate and lactate across the zones, and what training does to the curves.

05

12 MIN

Fitness, fatigue and form

Build a block, watch fitness and fatigue respond, and taper so you arrive fresh.

RUNNING OR RIDING

Same body.
Different demands.

Switch any lesson between running and riding. The muscles, forces and examples change with it, which is the point: the same fitness costs your legs very differently in each sport.

Built for triathletes, useful to anyone who runs or rides.

WHERE THE NUMBERS COME FROM

Models, not guesses.

The figure moves with joint angles and muscle timing from published biomechanics research. The fibre, fuel and load lessons use simplified models of well-established physiology, and each lesson lists its sources.

About the models

These are teaching models. They show typical patterns for a healthy, trained adult; your own timing, thresholds and responses will differ. Nothing here is medical advice. If something hurts, get it assessed.

The 3D anatomy is adapted from Z-Anatomy and BodyParts3D (© The Database Center for Life Science), used under CC BY-SA 4.0; our rigged version is shared under the same licence.