Before the volleyball match, the first referee will preside over the draw. What activities will the two sides participate in?

Captain. Before the volleyball match, the first referee presides over the participation of the captains of both sides, and the winner can choose to serve or receive the serve. Volleyball is one of the ball games. This stadium is rectangular with a high net in the middle. Both sides (6 players from each side) occupy one side of the court, and the players hit the ball from the net with their hands.