The Frenzel Equalization Technique: A Beginner's Guide to Going Deeper Safely

Ask any freediving instructor what stops new divers from progressing past 10 meters, and the answer is almost always the same: equalization. More specifically, the inability to break away from the Valsalva maneuver — the forceful exhale against a pinched nose that most people learn instinctively on airplanes. Valsalva works on land but fails in deeper water, where the technique can cause lung squeeze and discomfort. The professional alternative is the Frenzel technique.

What Makes Frenzel Different

In a Valsalva maneuver, air is pushed from the lungs by contracting the diaphragm and abdominal muscles. This requires the lungs to be flexible enough to generate pressure — something that becomes physically impossible past residual volume, which most divers reach between 20 and 30 meters.

The Frenzel technique bypasses the diaphragm entirely. Instead, the tongue acts as a piston, compressing a small pocket of air in the mouth and upper throat and directing it toward the Eustachian tubes. Because it does not rely on lung compression, Frenzel continues to work even when the lungs are tightly squeezed at depth.

Learning the Movement on Land

Step one: close the epiglottis by making a soft K sound and holding it. The airway to the lungs is now sealed. Step two: with a pinched nose, move the back of the tongue upward and backward, as if saying the letter K slowly. A faint click in the ears signals a successful equalization.

Practice this dry, in front of a mirror, several times a day. The movement should become automatic before you take it underwater. Most students need one to two weeks of consistent dry training before the technique transfers reliably to the pool.

Common Mistakes to Watch For

Beginners often revert to Valsalva under pressure without realizing it, pushing from the abdomen instead of the tongue. A good self-check is to place a hand on your stomach while equalizing — if the abdomen moves, you are still using Valsalva. Video feedback from an instructor accelerates progress dramatically. Consider enrolling in a certified freediving course where the technique is taught systematically.