Deep Equalization Course

The Deep Equalization Program is a structured dry training designed to help you understand, practice, and master equalization techniques for depth.

It provides a clear framework to develop efficient, safe, and reliable equalization—without guesswork.

The techniques covered are Deep Frenzel (reverse packing Frenzel) and Mouthfil Frenzel.

Matthieu Duvault is a professional Freediver with over 9 national records in various disciplines of deep freediving and a maximum depth of -103 meters. Matt specializes in equalization and performance training.

With 10 years of experience working with divers of all levels, Matthieu focuses on simplifying complex concepts and helping students develop precise, reliable techniques that translate directly to depth.

His approach combines physiology, technique, and practical application—giving divers the tools they need to progress safely and efficiently.

This program is for:

• Freedivers looking to go deeper safely

• Divers struggling with equalization at depth

• Competitors looking to get their Equalization to the highest level for deeper dives

• Anyone wanting to refine technique and gain more understanding and control over Frenzel

Whether you are progressing beyond basic equalization or aiming to improve performance, this program gives you the tools to move forward.

The program is structured into key modules:

• Introduction
  Understanding deep equalization and common mistakes

• Physiology
  How your body reacts to pressure and depth

• Physics
  The principles of pressure and volume affecting equalization

• Reverse Packing
  Developing coordination and timing for successful deep dives

• Mouthfill Frenzel Technique
  Step-by-step breakdown including charge and air management in constant pressure and pulsing techniques

No—this is a dry training program.

All techniques are taught and practiced outside the water, allowing you to build proper mechanics, awareness, and control before applying them during dives.

Training on land allows you to:

• Focus fully on technique without external pressure

• Develop correct muscle coordination

• Build consistency and control

This approach accelerates learning and reduces frustration in the water.

With consistent practice, you can expect to:

• Improve equalization efficiency

• Gain better control at depth

• Reduce tension and compensation

• Build a solid foundation for deeper diving

The program includes approximately 3 hours of structured content, divided into focused modules:

• Introduction, Physiology & Physics — ~30 minutes

• Deep Frenzel Technique — ~1 hour

• Mouthfill Frenzel Technique — ~1 hour 30 minutes

Each section is designed to be clear, practical, and easy to follow, allowing you to progress step by step at your own pace.

This is a dry training program and requires minimal equipment.

Ideally, you can use:

• A nose clip

• An equalization training tool (EQ tool)

These can help you better isolate movements and develop control.