[JetMetFan]

NBA Rule 4, Section X

The act of shooting starts when, in the official’s judgment, the player has started his shooting motion and continues until the shooting motion ceases and he returns to a normal floor position.

NBA Comments on the Rules, 4C

A defensive player is not permitted to move into the path of an offensive player once he has started his upward motion with the ball to attempt a field goal or pass.

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NCAA 4-73-3, 4 & 7

Art. 3. The try shall start when the player begins the motion that habitually precedes the release of the ball on a try...
Art. 4. A try shall end when the throw is successful, when it is certain the throw is unsuccessful, when the thrown ball touches the floor or when the ball becomes dead.
Art. 7. An airborne shooter, who is fouled by an opponent, while in the air but after the ball is released shall be considered to be in the act of shooting until that airborne player returns to the floor.

NCAA 4-14

Continuous motion applies to a try for field goal or free throw, but shall have no significance unless there is a foul by the defense during the interval that begins when the habitual throwing movement starts a try or with the touching on a tap
and ends when the ball is clearly in flight.

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NFHS 4-41-1, 3 & 4

ART. 1 The act of shooting begins simultaneously with the start of the try or tap and ends when the ball is clearly in flight, and includes the airborne shooter
ART. 3 The try starts when the player begins the motion which habitually precedes the release of the ball.
ART. 4 The try ends when the throw is successful, when it is certain the throw is unsuccessful, when the thrown ball touches the floor or when the ball becomes dead.

NFHS 4-11-2
If an opponent fouls after a player has started a try for goal, he/she is permitted to complete the customary arm movement, and if pivoting or stepping when fouled, may complete the usual foot or body movement in any activity while holding the ball. These privileges are granted only when the usual throwing motion has started before the foul occurs and before the ball is in flight.