Freediving Disciplines Explained - CWT, FIM, STA, DYN and More
Freediving disciplines explained in plain English. Learn what CWT, CWTB, CNF, FIM, STA, DYN, DYNB and DNF mean, what each trains and where to start.
In short
Every major freediving certification agency teaches the same core skills - relaxation, safe breath-hold, equalization, buddy rescue - in a three or four step ladder from beginner to master level. The agency matters far less than the instructor, so choose a course based on teaching quality, class size and safety culture, then check the agency's current standards for exact requirements.
Choosing a freediving certification can feel confusing at first. AIDA, PADI, SSI, Molchanovs and several smaller agencies all sell courses with different names, and the marketing makes each one sound unique. The good news is that the core curriculum is remarkably similar across all of them, and any reputable agency will teach you to freedive safely.
This guide compares the main agencies side by side, explains what you actually learn at each level, and gives you a practical way to decide which freediving course to book. Exact requirements change from time to time, so treat the numbers here as typical ranges and confirm the details with the agency's current standards before you sign up.
The short answer - the instructor matters more than the agency
If you remember one thing, make it this: a great instructor teaching any major system will produce a safer, more relaxed freediver than an average instructor teaching the "best" system. All of the agencies below teach relaxation, breathing, duck dives, finning, equalization, safety protocols and rescue. They differ mainly in naming, pacing, how much pool work they include and the culture around training.
Ask any school these questions before you book:
- How many students per instructor in the water?
- How many open water sessions are included, and how long is each?
- Will I practice rescues from depth, not just at the surface?
- What happens if I struggle with equalization - can I repeat sessions?
- Is there a club or regular training group I can join afterward?
The main agencies at a glance
The table below groups each agency's courses into four broad stages. Names and structure are accurate at the time of writing, but agencies revise their programs, so check their current course lists.
| Stage | AIDA | PADI | SSI | Molchanovs |
|---|---|---|---|---|
| Introduction | AIDA 1 | Basic Freediver | Basic Freediving / Try Freediving | Lap 1 (pool course) |
| Beginner certification | AIDA 2 | Freediver | Freediving Level 1 | Wave 1 |
| Intermediate | AIDA 3 | Advanced Freediver | Freediving Level 2 | Wave 2 |
| Advanced / master | AIDA 4 | Master Freediver | Freediving Level 3 | Wave 3 and Wave 4 |
A few notes on the table:
- AIDA is the oldest of the four and also runs international competitions, so its courses connect directly to competitive freediving and judge training.
- PADI and SSI are large scuba agencies that added freediving programs. Their strength is reach - you can find an instructor almost anywhere - and they integrate well with dive centers.
- Molchanovs is a training system built around a structured, athlete-style progression. It also offers pool-focused courses for divers who mostly train in lanes.
- CMAS, Apnea Total and other agencies also certify freedivers. They are well respected in many regions, especially Europe and Southeast Asia.
What you learn at each level
Introduction courses
These are short, often pool-only or very shallow programs designed to show you what freediving feels like. You will learn a relaxed breathe-up, a first static breath-hold, basic finning and the idea of the buddy system. They are a great way to find out whether you enjoy the sport before committing several days and a larger fee.
Beginner certification
This is the course most people mean when they say "learn to freedive." Expect a mix of theory, confined water and open water sessions. Typical content includes:
- Physiology basics - why we feel the urge to breathe, what blackout is and why hyperventilation is dangerous
- Relaxation and the breathe-up, plus recovery breathing after surfacing
- Static apnea in the pool, usually with a modest target time
- Dynamic swimming underwater along the pool
- Duck dives, efficient finning and line diving
- The Frenzel or Valsalva maneuver for equalization
- Buddy protocol, surface rescue and recovering a diver from shallow depth
Depth targets at this level are usually modest, often in the range of roughly 10 to 20 meters depending on the agency and your comfort. Many students do not hit the depth target on the first course because equalization takes time, and that is completely normal.
Intermediate
The intermediate course builds on solid basics. You will refine equalization (often moving fully to Frenzel and starting to learn about mouthfill), work on freefall, improve your technique on the way up, and practice deeper rescues. Theory goes further into physiology, the effects of pressure and training methods such as CO2 and O2 tables, which we explain in our guide on how to hold your breath longer.
Depth targets are typically in the mid-range, roughly 20 to 30 meters, with longer static and dynamic requirements.
Advanced and master levels
At the top of each ladder, courses focus on deep equalization (mouthfill), managing narcosis and pressure on the lungs, training planning, and safety for deeper dives. Some agencies split this into a performance level and a separate instructor-track level. Depth targets often sit at 30 meters and beyond, but these are serious dives that require good preparation and a coach who knows your history.
How to choose the right freediving course
Start with logistics
Where you live and where you travel will narrow your choices quickly. If your local pool runs a Molchanovs or AIDA club, that is a strong reason to certify with them, because you will have a ready-made training group afterward. If you are learning on holiday, look for a school with a strong track record at the destination - established freediving hubs tend to have experienced instructors, reliable conditions and plenty of training lines.
Look at time in the water
Compare how many sessions each course includes and how long you actually spend diving. Some courses pack in a lot of classroom theory; others put more of that into self-study and give you extra open water time. More supervised dives usually means more confidence and better rescue practice.
Consider class size and ratios
A ratio of two or three students per instructor on the line is ideal for beginners. Larger groups mean more waiting at the surface, more cold, and less individual feedback on your duck dive and equalization.
Think about your goals
- If you want to compete, AIDA or CMAS make sense because they run sanctioned competitions.
- If you love structured training plans, the Molchanovs system is built around them.
- If you mostly want to explore reefs and combine freediving with scuba trips, a PADI or SSI course at your favorite dive center works well.
- If you train in a pool through winter, look for pool-focused courses or clubs.
Cost and time factors
We will not quote prices because they vary enormously by country, school and season. Instead, here is what drives the cost:
- Location. Courses in major freediving hubs are often cheaper and better equipped than in places where freediving is rare.
- Course length. More days and more open water sessions cost more but usually deliver better value per dive.
- What is included. Check whether the fee covers certification, manual or app access, boat fees, pool entry and gear rental.
- Group size. Private or semi-private tuition costs more but can be worth it if you struggle with equalization.
- Gear. You can rent for your first course, but a well-fitting low-volume mask and a wetsuit that suits the water temperature make a big difference. See our beginner freediving gear guide for what to buy first.
On time, expect two to four days for a beginner course, three to five days for intermediate, and longer for the advanced levels. Leave a buffer day if you can, because weather, a cold or a stubborn ear can easily cost you a session.
Switching agencies and crossover courses
You are not locked in. Most agencies and schools accept cards from other major systems as proof of prior training, and many offer crossover programs that map your existing level onto theirs. You may be asked to demonstrate skills or complete a short assessment. This is a good thing - it protects you and your buddy.
After your course - keep training safely
Certification is the start, not the finish. The divers who progress fastest and stay safest are the ones who keep training regularly with a reliable buddy, follow the one-up one-down rule and keep their rescue skills sharp. Read our article on freediving safety rules and the buddy system to understand the habits that should follow you from your first course onward.
Finding that buddy is often the hardest part after a course ends. That is exactly why we are building BuoyBuddy, a freediving buddy-finder app coming soon to iOS and Android that helps you find certified divers nearby, join or host sessions and log your dives. Until then, your course school and local club are the best places to meet people at your level.
Whichever agency you choose, look for patient instruction, plenty of time in the water and a strong safety culture. Those three things will shape your freediving far more than the name printed on your card.
Frequently asked questions
Which freediving certification is best for beginners?
AIDA, PADI, SSI and Molchanovs all offer solid entry-level courses that teach safe breath-hold, equalization and rescue. The quality of your instructor and the ratio of students to instructor matter more than the logo on the card. Pick a well-reviewed school with small groups and plenty of open water time.
Is a PADI freediving certification recognized by AIDA schools?
Most schools accept certifications from other major agencies as proof of training, and many offer crossover courses so you can continue in their system. Policies differ by school and agency, so ask before booking. Expect a skills check on your first day regardless of which card you hold.
How long does a beginner freediving course take?
Most entry-level courses run over two to four days, mixing theory, pool or confined water sessions and open water dives. Some schools split the course across several weekends. Shorter discovery programs of a single day exist if you just want a taste first.
Do I need a freediving certification to freedive?
No law requires a card for recreational freediving in most places, but a course is the safest way to learn. It teaches you how to recognize and respond to blackout, which is the skill that keeps your buddy alive. Many dive centers, boats and training groups also ask for a certification before you join them.
Can I go straight to an advanced freediving course?
Generally no. Agencies require you to complete the previous level or pass an equivalency assessment, because advanced courses assume solid rescue skills and comfort at moderate depth. Skipping steps also tends to slow your progress, since most plateaus come from gaps in fundamentals.
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