The Breethly Glossary.
The language of Nervous System Fitness, defined in plain English. The ownable terms and everyday concepts behind how Breethly trains your calm, focus and recovery.
The Breethly Lexicon, A–Z.
Our Words, Defined.
Breethly has a vocabulary of its own: some terms we coined, some borrowed and made plain. Here's what each one means, with no jargon and no medical claims.
The Breethly Lexicon.
Nervous System Fitness
The trainable skill of steering your own state: how fast you calm down, how cleanly you come up, and how steady your baseline sits. The whole idea Breethly is built around.
BreathOS™
The Breethly app that pairs with the device. It logs your sessions, surfaces your Breathe Metrics, and guides your training: the operating system for your practice.
Breathe Metrics
The consumer-friendly measures Breethly shows you: your Calm Score, recovery speed, streaks and trends. Proof your practice is working, without the clinical clutter.
Calm Score
A simple, in-session read of how settled your system is, distilled into one number you can watch move during a session and trend over time. A wellness signal, not a diagnosis.
Everyday Resets
Short, repeatable sessions, often as quick as ninety seconds, built for the gaps in a real day. The unit of practice, not a twenty-minute commitment.
Inhale / Exhale
The two halves of every breath, and of how we talk. The inhale lifts and sharpens; the exhale settles and recovers. Breethly trains both directions on purpose.
HRV in Plain Language
Heart rate variability: the small, natural variation between heartbeats that wearables track as a big-picture recovery signal. Read it as a personal trend, never a verdict. See the full HRV guide for more.
Breath Coach
Your in-app coach today and a dedicated device coming next: BreathOS™ reads your breath in real time and guides you toward the state you want with live biofeedback, and the standalone Breath Coach will bring the same loop off-screen.
Science You Can Feel
Breethly's promise: grounded methods you don't just read about, but notice working in your own body within a session. Substance over hype.
“Clear words, honest claims. If you can't feel it, we won't say it.”