The science of human movement.
Twelve plain-English lessons on how the body moves, from the planes of motion to the sliding filaments inside a single muscle fiber. A 50-muscle movement atlas, over 130 practice questions, and working calculators for one-rep max, heart-rate zones, and biomechanical leverage. Free, forever, for athletes, coaches, students, and the curious.
Where to begin.
Twelve lessons, the whole field.
Who built the science of movement.
Milestones in kinesiology.
The body by the numbers.
Ideas worth carrying with you.
Common questions, plain answers.
The subdisciplines, side by side.
Where this science goes to work.
Things that are not true.
Learn how the body moves.
Start anywhere. Each lesson stands alone, reads in about twelve minutes, and can be read aloud. Tap a card to open it.
Real movements, taken apart.
Everyday and athletic movements analyzed the way the field does it: joints, planes, prime movers, and what to watch for. Tap any to expand.
Ideas the whole field rests on.
The numbers, step by step.
Test what you know.
Over 130 questions across all twelve topics, with an explanation after every answer. Pick a focused set or take the mixed challenge.
Mixed sets.
Focus on one area.
Run the numbers.
Six working calculators built from the formulas in the lessons. Everything runs in your browser. Nothing is stored or sent anywhere.
The reference library.
Over fifty major muscles with origins, insertions, and actions. The planes and movements of the body. Joint types. And normal ranges of motion.
| Muscle | Origin | Insertion | Primary action |
|---|
Naming the motions.
| Joint | Motion | Normal range |
|---|
Ranges are typical adult active values and vary with age, training, and measurement method. Use as a reference, not a clinical standard.
| Bone | Division | Note |
|---|
Common movement-related issues, with cause and current thinking on management. Educational only, not medical advice.