How Your Lungs Work
Like Duolingo, but for How Your Lungs Work. Tomo turns the whole topic into a game you play five minutes a day, until it actually sticks.
For the part of you with thirty open tabs that never became anything.
Free forever · No credit card · iPhone & Android

Key ideas in How Your Lungs Work
- Lungs are passive tissue similar to balloons
- The diaphragm acts as the floor of the chest cavity
- Lungs lack the muscle fibers to move themselves
- The diaphragm moves downward toward the stomach to inhale
- Lungs rely on external pressure changes to expand
- Moving the diaphragm down creates a vacuum in the chest
- The mechanical action of the diaphragm
- Belly breathing moves the organs out of the way so the lungs can stretch downward
- Chest breathing is restricted by the rigid structure of the upper ribs
- Lung tissue is elastic and naturally wants to shrink back
- Exhaling during rest doesn't require muscle effort
- The physics of a relaxed exhale
- The rib cage provides a rigid frame that protects the lungs
- Why belly breathing is more effective for lung capacity
- Ribs move up and out like a bucket handle to increase lung volume
- Rib movement is essential for maximizing air intake
You've tried the other tabs
Thirty open tabs. Four facts you actually kept.
You watched. You nodded. By Sunday it was gone.
One answer, then back to scrolling.
Eight weeks. You meant to finish. You didn't.
Tomo gives How Your Lungs Work the Duolingo treatment: levels, streaks, and quick quizzes that test what you just learned. That game loop is what the tabs above never had, so it's the one you actually finish.
Here's what playing it feels like
A real question from this course. Take your best guess.
Where is the diaphragm located in relation to your chest cavity?
Get it right to open this lesson and 11 more in the app.
Where How Your Lungs Work takes you
Discover the hidden engine behind every breath. Learn how your body captures air, powers your blood, and how you can use breathing to control your energy and stress.
- 1
The Mechanics of Breathing
- How You Actually Move Air
- The Great Gas Exchange
- 2
Mastering Your Airflow
- Taking the Controls
- Protecting the Filter
2 sections · 4 units · 12 levels. Built to play, not to enroll.
You pick the voice
How Your Lungs Work is taught in the The Bestie style: your friend who just gets it. Want a different feel? In the app you can spin up the same topic in any of Tomo's teaching styles. Same facts, totally different vibe.
More Health on Tomo
Intermittent Fasting: Metabolic Precision
Move beyond simple calorie restriction to master the molecular signaling of fasting. Learn to synchronize your metabolic clocks and optimize cellular cleanup for peak longevity and performance.
The Energetic Life of Crystals
Move beyond basic stone meanings to master the mechanics of resonance, mineralogical frequency, and advanced energetic layouts for professional-grade practice.
Barbell Strength and Muscle
Move past beginner gains and build a professional-grade physique. Master the big four lifts, optimize your programming to eliminate 'fuckarounditis,' and learn the science of hypertrophy and recovery.
Fitness and Food at Home
Transform your living space into a powerhouse of health. Learn to tone your body using only your own weight and master the art of simple, nutritious home cooking.
Reclaiming Your Evening
Stop the post-work doomscroll and transform your evening from a passive blur into a restorative 'third space' that actually recharges you.
Advanced Critical Care Paramedicine
Move beyond standard protocols by mastering the cellular pathophysiology and receptor-level pharmacology that drive high-stakes clinical decisions in the field.
Start How Your Lungs Work today.
Download Tomo, search How Your Lungs Work, and play your first lesson in under a minute.