What is a requirement for a valid throw-in?

A valid throw-in must be executed properly to ensure the restart of play is in accordance with the Laws of the Game. One of the critical requirements is that the thrower must have both feet on the ground or on the touchline when delivering the ball. This ensures that the throw is conducted in a controlled manner, allowing for fair play and minimizing any advantage that could arise from improper execution.

Having both feet grounded means that the thrower cannot lift one foot off the ground before or during the throw, which helps maintain equilibrium and stability during the action. It also reinforces the importance of proper technique and adherence to established rules. This requirement not only serves to standardize the procedure but also upholds the integrity of the game by ensuring that all players follow the same rules.