The Frenzel technique is the equalization method that takes you from struggling at 4 metres to comfortably reaching depth, and it's the single most valuable skill a new freediver or spearfisher can learn. Instead of pushing air up from your chest, you use your tongue as a piston to drive a trapped pocket of air into your ears. This guide breaks down exactly what the Frenzel is, how it differs from Valsalva, how to find the muscles involved, and the five-step movement — all of which you can rehearse on dry land.
This is the hands-on companion to our complete guide to freediving equalization, which covers where the Frenzel fits among all the techniques. Here we focus only on doing it.
What the Frenzel Technique Is
The Frenzel technique works by isolating a small volume of air in your mouth and upper throat, sealing it off from your lungs, and then compressing it with the back of your tongue so it has nowhere to go but up the Eustachian tubes to your middle ears. The name comes from Hermann Frenzel, who taught it to dive-bomber pilots in the 1930s; freedivers adopted it because it solves the problem that defeats every other method at depth.
The key insight is that the Frenzel doesn't rely on your lungs at all. You're not breathing out against a closed nose — you're using a tiny, isolated air pocket and a muscular movement. That's why it keeps working when your chest is compressed deep underwater, and why it costs you almost no air.
Frenzel vs Valsalva in One Minute
If you've ever pinched your nose and "blown" to clear your ears on a plane, you've done a Valsalva. It works near the surface but has real limits underwater. Here's the short version of the difference:
| Aspect | Valsalva | Frenzel |
|---|---|---|
| Air source | Lungs (diaphragm push) | Trapped pocket in mouth and throat |
| Works at depth | No — fails when lungs compress | Yes |
| Air cost | High | Almost none |
| Injury risk | Higher | Lower and controllable |
We go deeper on this trade-off in Frenzel vs Valsalva, but the takeaway is simple: learn the Frenzel and make it your default.
Finding Your Glottis and Soft Palate
The Frenzel depends on controlling two parts of your throat most people never think about:
- The glottis — the valve at your voice box that you close when you hold your breath or lift something heavy. Take a breath, then "freeze" it without closing your mouth: that's your glottis shutting.
- The soft palate — the soft tissue at the back of the roof of your mouth. It can route air to your nose (say "kuh-kuh") or to your mouth (say "ahh"). For the Frenzel it needs to sit in a neutral position so air can travel to your ears.
Spend a few minutes just feeling these move. Most people who "can't Frenzel" simply haven't isolated the soft palate yet — once you can hold it neutral while your glottis is closed, the rest falls into place.
The Frenzel Technique, Step by Step
Run through these slowly and dry the first dozen times. Speed and depth come later.
- Pinch your nose so air can't escape that way.
- Fill your mouth with a small amount of air — cheeks slightly relaxed, not puffed hard.
- Close your glottis to seal that air off from your lungs (the "frozen breath" feeling).
- Keep your soft palate neutral so the air pathway to your ears stays open.
- Push your tongue up and back, like swallowing the letter "K", compressing the trapped air. You should feel both ears fill.
That tongue movement is the whole technique. If your ears click or fill, you've done it. If nothing happens, the usual culprit is the soft palate slipping out of neutral or the glottis not sealing — back off and isolate each part again.
Common Frenzel Mistakes
Three mistakes account for most failures. First, using the chest — if you feel your stomach or chest tense, you've slipped back into Valsalva. The Frenzel is all mouth and throat. Second, a wandering soft palate — if air keeps escaping out your nose-side or you hear a snore-like sound, the soft palate isn't neutral. Third, equalizing too late — even a perfect Frenzel can't open an already-locked tube, so stay ahead of the pressure.
Master the dry movement first, then take it shallow and build down slowly. For a structured set of drills to develop it, see our equalization guide and dry-land exercises.
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