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Like any technique, there's a spectrum of skill level.
'Optimal' Frenzel can be used safely & effectively to depths of +60m, and even for shallower divers it's worth learning because it can remove common issues like contractions during the descent, shallow squeezes, and EQ failure in the 30-40m range.
In this video I explain & demo 'optimal frenzel', and share 4 dry exercises you can use to develop the skill level to frenzel in a more efficient & effective way.