Increase YourBreath Hold Time.

CO₂ tables, O₂ tables, and guided apnea sessions — structured breath training trusted by freedivers and performance athletes worldwide.

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4.8★·

12,000+ athletes trained worldwide

Your lungs have untapped capacity. These protocols are how you access it.

Ocean waves
Most Popular

Box Breathing

Inhale 4 · Hold 4 · Exhale 4 · Hold 4. The Navy SEAL protocol for instant stress control.

Navy SEALStressFocusSleep
Nature and breath
Advanced

CO₂ & O₂ Tables

The core of competitive freediving. Systematically raise CO₂ tolerance and increase breath-hold capacity over weeks.

Built for Performance,
Not Just Relaxation

Most breathing apps teach calm. BreathHold trains your respiratory physiology — the CO₂ tolerance and O₂ efficiency that separate casual breathers from elite divers.

  • CO₂ & O₂ TablesClassic freediving protocols adapted for mobile training
  • Guided Apnea SessionsStep-by-step breath holds with accurate phase timing
  • Progress AnalyticsWeek-over-week graphs showing measurable improvement
  • Works OfflineTrain underwater or in the field — no connection needed
Ocean — the environment that defines breath-hold training

Start Training Today

Free to download. CO₂ tables, box breathing, and guided apnea sessions — no subscription required.

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