Train Your
Breath Hold
CO2 and O2 tables with a built-in timer. Pick a preset or build your own. Hit start and breathe. Every session gets saved automatically.
What Is the
Apnea Trainer
Breath Hold Training, Simplified
Apnea training on land is straightforward. You hold your breath, rest, and repeat. The structure of those holds and rests is what makes the difference between random practice and real progress. That structure is called a table.
Tables Are Free Knowledge
CO2 and O2 tables have been around for decades. They're published in every freediving course manual. They're numbers and a timer. Yet most apnea apps charge $10 or more per month for what is essentially a countdown clock with a spreadsheet behind it. The DEEPLINK apnea trainer gives you presets for every level, a custom table builder, a hands-free timer with audio cues, and full session history. All free. Because breath hold training shouldn't have a paywall.
Training Tables
CO2 Tolerance Tables
A CO2 table keeps the hold time the same across every round but shortens the rest between rounds. Round after round, the carbon dioxide in your blood builds up because you never fully recover. That's the point. Your body learns to tolerate higher CO2 levels, which means the urge to breathe comes later. For most freedivers, CO2 tolerance is the first bottleneck. The contractions hit early, the panic follows, and the dive ends. CO2 tables push that threshold back.
O2 Capacity Tables
An O2 table does the opposite. Rest stays the same, but hold times get longer each round. You recover fully between rounds, but each hold demands more from your body's oxygen reserves. O2 tables train your system to perform under lower oxygen levels. They're generally harder than CO2 tables and more relevant for divers pushing their max depth or max time. If CO2 tables teach you to ignore the alarm, O2 tables teach you to function when the tank is genuinely running low.
Presets and Custom Tables
The trainer includes presets for beginners, intermediate, and advanced divers for both CO2 and O2 tables. Pick one and start. When you outgrow the presets, build your own. Set the number of rounds, hold times, rest intervals, and how each progresses from round to round. Save your custom table, name it, and reuse it whenever you want. Your tables, your progression, your pace.
Built-In Timer
Hands-Free, Eyes Closed
Good apnea training requires relaxation, which means you shouldn't be staring at a screen or counting in your head. The timer runs audio cues that tell you when to breathe and when to hold. Lie down, close your eyes, and let your body do the work. A visual countdown is there if you want it, but the audio alone is enough to follow the entire session without touching your phone.
Round Progress and Session Summary
During the session, the timer shows which round you're on, how long you've held, and what's coming next. After you finish, you get a full session summary: each round's hold time, total session duration, and the table you ran. Every completed session is saved automatically. No manual logging, no forgetting. It just goes into your history.
Full Session History
What table did you run last Tuesday? How long was your hold on round 6? Are you improving compared to two weeks ago? The history has the answers. Every session is timestamped with the table used, individual round hold times, and totals. Over time, you see patterns. Consistency shows. Gaps show. Progress shows.
Explore More
Goes well with this.
Apnea Trainer FAQ
Common questions about breath hold training with DEEPLINK.
Start Training Your Breath Hold
Free tables. Free timer. Free history. No paywall, no catch.