Equalization & Apnea Trainer

Ever turned back because your ears wouldn't clear?

In freediving the first thing that stops you is not your lungs — it is your ears. Miss the equalization timing and you will not get past a few meters. Frenzel Master drills that timing, and the breath hold rhythm behind it, on dry land before you ever get in the water.

■ Equalize on the way down

Pressure climbs as you descend. Equalize late and your ears lock up and the descent stops. Practice against a real descent rhythm until the timing is automatic.

• CWT (finning) and FIM (pulling the line)
• Pressure, buoyancy and oxygen consumption modelled by depth
• Every dive logs your equalization count and the depth you stalled at
• Step-by-step Frenzel technique guide with anatomy explained

■ The breathe-up, in the real order

Breathe-up → limp phase → passive exhale → final inhale → glottis lock. The same sequence and timing used before a real dive.

• The final inhale fills belly → ribs → clavicle
• The lung gauge stops you at 85–90%, never 100%
• Haptic cue on every phase change, so you can follow it with your eyes closed

■ Breath hold tables (CO2 / O2)

• CO2 table — shrinking rest intervals build carbon dioxide tolerance
• O2 table — growing holds train hypoxic adaptation
• Static apnea timing and personal bests
• Tables generated from your own current numbers

■ Your progress adds up

• Daily training streak and practice reminders
• Best depth, longest hold, equalization success rate
• Dive logbook and progress charts
• Sign in with Google to keep everything across devices

■ Who this is for

• Divers whose descent stops because equalizing fails
• Beginners preparing before a freediving course
• Divers keeping the feel between seasons
• Scuba divers who get ear pain on descent

■ Safety — please read

This app is a dry-land practice tool.

• Never use this app while you are in the water.
• Never do breath hold training in water alone. Blackout comes without warning and is fatal when nobody is watching. Always train with a dedicated buddy.
• This app does not replace instruction from a qualified freediving instructor and does not provide medical advice.
• If you have a respiratory or cardiovascular condition, or you are pregnant, talk to a doctor before starting.

Contact: ilbeol.com@gmail.com
Website: https://ilbeol.com/pages/frenzel_master