During a throw-in, what is required for the action to be considered legal?

For a throw-in to be considered legal, it is essential that the ball is thrown with both hands. According to the Laws of the Game, a player must use both hands to deliver the ball from behind and over their head, ensuring that the throw is executed in a controlled manner. This requirement promotes fairness and consistency in the game, allowing for a proper reintroduction of the ball onto the field.

The other options, while relevant in their own right, do not meet the criteria necessary for legality in a throw-in situation. For instance, players are allowed to be in motion during the throw as long as they adhere to the two-hand rule. Additionally, the ball must not touch the ground before entering play, as it is expected to be thrown directly into play. Finally, while the throw-in should be taken from the spot where the ball went out of bounds, it is not a requirement that it be from the "original location" prior to the out-of-bounds incident, since the throw-in must take place at the point of exit. Thus, the requirement of using both hands is the key factor that makes the action legal.