How do I serve in sitting volleyball?

• The ball is hit with one hand or any part of the arm after being tossed or released from the hand(s). Only one toss or release is allowed, though dribbling or moving the ball in the hands is permitted. A service hit without a toss or release is allowed only for players with a classified hand impairment.
• At the moment of the service hit, the server's buttocks must not touch the court (the end line included) or the floor outside the service zone. The server's foot (feet), leg(s) or hand(s) may touch the court and the free zone outside the service zone.
• The server must hit the ball within 8 seconds after the first referee's whistle for service.
• The server lifting his or her buttocks is a service fault.
• Screening: the serving team must not stop the receiving team seeing the service hit and the ball's flight path by waving arms, moving sideways or sitting grouped. Serving-team players may not raise hands above the head during service until the service hit, and back-row players cannot have arms or hands above their shoulders.

Source: World ParaVolley Official Sitting Volleyball Rules 2025-2028, Rule 12 (screening wording as updated in the February 2025 approved rule changes).