Any Two means that a player put all his chips with any possible hand all-in. Does not matter he have AK or 72, all his chips will go to the middle. Players have to push any two mostly when they are under pressure in a sit&go tournament or a big multi table tournament. Important to have success with a any two push is that a player comes first in to the hand and that he have enough fold equity. If a player have no more fold equity a any two push make no sense.