# BreathHold - Complete Reference

> BreathHold is an apnea and breath hold training app for iPhone and Android. It includes CO2 and O2 tables, guided breathing sessions, baseline tests, and progress history.

## About BreathHold

BreathHold provides timers, editable apnea tables, guided breathing patterns, instructional videos, and saved session history for dry-land practice.

The app combines apnea tables with guided breathing exercises. During a breath hold, rising carbon dioxide contributes to the urge to breathe, while oxygen, lung volume, and other physiological signals also affect the breakpoint.

## Core Features

### CO2 Tolerance Training
Training tables with a fixed hold time and progressively shorter rest intervals. Users can generate sessions from a current breath-hold test or edit the table themselves.

### O2 Table Training
Training tables with fixed rest periods and progressively longer holds. These sessions expose the user to a different pattern from CO2 tables; they do not guarantee a specific performance outcome.

### Box Breathing (4-4-4-4)
Four equal phases: inhale, hold, exhale, and pause. The app includes visual guidance, audio cues, and adjustable phase duration.

### Rectangular Breathing
Customizable breathing ratios let users set durations for inhale, hold, exhale, and pause phases. The app includes presets for common patterns.

### 4-7-8 Breathing Technique
A guided breathing session with a 4-second inhale, 7-second hold, and 8-second exhale, shown with animated visual guidance.

### Progress Tracking
Track breath-hold tests and completed sessions over time. The progress view includes session history and personal-best data.

### Instructional Video Tutorials
Video content demonstrates the app's training modes and breathing-session formats.

### Audio-Guided Sessions
Sound cues mark inhale, hold, exhale, and recovery phases during dry-land sessions. In-water breath holds require a trained buddy and should never be performed alone.

## Who Uses BreathHold

- Freedivers and spearfishers looking for structured dry-land apnea sessions
- People learning about breath-hold safety and dry-land preparation
- Athletes who want a timer and training history
- Yoga and breathing-practice users who want guided breathing ratios

## Availability
- Free to install with optional in-app purchases
- Available on iPhone and Android
- Google Play displayed 1K+ downloads in July 2026

## Author
Content on breathhold.co is written by MJ Kühn, a Freediving Instructor Trainer and
Functional Breath Coach who co-founded BreathHold. He teaches freedivers and trains
other instructors, and also teaches yoga breathing practices such as Ujjayi and
Kapalabhati. Profile: https://breathhold.co/about
Instagram: https://www.instagram.com/mj.kuhn/

Editorial policy, including how evidence is weighed and how corrections are handled:
https://breathhold.co/methodology

## Breathing Techniques (Free Web Tools)
The website offers free interactive breathing tools:
- Box Breathing: https://breathhold.co/breathing/box
- 4-7-8 Method: https://breathhold.co/breathing/four-seven-eight
- Rectangular Breathing: https://breathhold.co/breathing/rectangular

## All Links
- Website: https://breathhold.co
- iOS App: https://apps.apple.com/us/app/breathhold-apnea-trainer/id6741862878
- Android App: https://play.google.com/store/apps/details?id=com.breathhold.apnea.stamina.training&referrer=utm_source%3Dbreathhold-web%26utm_medium%3Dorganic_web%26utm_campaign%3Dllms-full%26utm_content%3Dllms%26utm_term%3Den
- Blog: https://breathhold.co/blog
- Resources: https://breathhold.co/resources
- Free Tools: https://breathhold.co/tools
- Breathing Techniques: https://breathhold.co/breathing
- About the author: https://breathhold.co/about
- Editorial methodology: https://breathhold.co/methodology
- Freediving Schools: https://breathhold.co/freediving-schools
- Static Apnea: https://breathhold.co/resources/what-is-static-apnea
- CO2 vs O2 Tables: https://breathhold.co/resources/co2-table-vs-o2-table
- Breath-Hold Contractions: https://breathhold.co/resources/breath-hold-contractions
- Contact form: https://breathhold.co/contact