David Schmittwilken

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Zenhold – Apnea Table TrainerBreath-hold tables on your wrist — no phone, no accont
Nov 2026

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Joined Product HuntOctober 30th, 2026

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Zenhold – Apnea Table Trainer - Breath-hold tables on your wrist — no phone, no accont

O₂/CO₂ apnea tables generated from your own max hold, with a timer that survives a locked screen and an Apple Watch app that runs the whole session on its own clock. Breathwork, retention rounds, heart rate. On-device, one-time Pro.