Frenzel is the equalization technique most freedivers eventually adopt because it works when your lungs are compressed at depth and your chest can no longer push air. Instead of squeezing your lungs, you use your tongue as a piston to drive a small pocket of air up toward your ears. It feels strange at first, then becomes second nature.
The parts you need to control
Three structures do the work. The glottis (the valve in your throat you use to hold your breath), the soft palate (the soft tissue at the back of the roof of your mouth), and the tongue. Learning to feel and move each one independently is the whole game.
A dry-land learning sequence
- Pinch your nose and make a hard K sound; feel the back of your tongue rise. That motion is the pump
- Close your glottis as if holding your breath, then notice you can still move your tongue freely
- Keep the soft palate in a neutral position so air routes toward your nose and ears, not back into your throat
- Pinch your nose and use the tongue piston to feel gentle pressure build in both ears
Find the neutral soft palate
If air keeps escaping into your throat or you cannot build pressure, your soft palate is likely in the wrong position. Practise the K and T tongue movements with your nose pinched until you feel the ears respond.
Taking it into the water
Once the movement is reliable on dry land, bring it into shallow practice. Equalize before you feel any pressure and repeat frequently as you descend, ideally every metre or so in the early depths. The technique should stay effortless; if it suddenly takes force, something is wrong.
Never force a stubborn ear
If an ear will not equalize, stop descending and ascend slightly until it clears. Pushing hard against a blocked ear can injure your eardrum and end your season.
Depth practice needs supervision
Work on Frenzel at depth only with a trained buddy or instructor present. Equalization struggles can distract you and increase risk, so never practise descents alone.
Frenzel rewards patience. Spend the dry-land time to truly isolate these structures, and the technique will carry you smoothly through the depths where chest-based equalizing simply stops working.