Half A Press

A Half A-Press is an easily performable move within Super Mario 64, and was given credence by Super Mario 64 YouTuber pannenkoek2012.

Description
The term is typically only applied to a fanmade challenge known as the A-Button Challenge, which strives to collect as many stars in Super Mario 64 as possible without utilizing the A-Button, and if the A-Button is required, to use as little A-Presses as possible. The term Half A-Press refers to when Mario enters the stage while holding down the A-Button, allowing a myriad of moves to be performed from the get-go without requiring the pressing of A while in the stage; the act of holding down the A-Button during the entrance of the stage and maintaining it until a certain point or the collection of the star.

The description of a Half A-Press is only useful when describing single-star runs of the A-Button Challenge, as when referring to the whole game, the Half A-Press would be rounded up as it "leeches" off a previous A-Press.

Behaviors
While holding down A, whether the A-Button was pressed before or during the duration of the stage, the player is able to perform short kicks, swim in water instead of performing broad strokes and spin in mid-air.

Anomalous Properties
Multiple players have reported anomalous effects while maintaining a Half A-Press status. These include, but are not limited to, appearances from the White-Eyed Chomp, Textureless Mario Anomaly, and inability to enter certain stages.

Trivia

 * Due to the complicated nature of the Half A-Press, the term has crept into meme culture, and has been covered by multiple YTP-ers and Meme Channels.