Beginners Singles: All parts of the body can be used to hit the ball over the net, including the hands, but the hands must be palms up, not at an angle, or in a spiking angle.
Intermediate/Advanced Players: All parts of the body are in play, kicking, chest, head, and shoulders and all parts of the legs are allowed, arms and hands are Not allowed in the game.
Offense Scoring: In singles the player serving the ball is the only one who can score points, the server has to palm/kick the ball over the net without going out of bounds which is outside of the net stand, and also keep the ball inside of the 15ft boundary, so they have 10ft by 15ft serving area, and during the serve the server can’t hit the net, but during the rally the ball can hit the net. If the server touches the ball with any part of their body and the ball doesn’t go over the net they lose their serve, but if the server doesn’t touch the ball they get another chance to serve, but only one more chance.
Defending: the defender on the opposite side of the net has too win the rally by hitting the ball back over the net without the ball hitting the ground, and at no time can any part of the defending player body part go over the net, all body parts must stay on their side of the net, either side defending during the rally has three hits with the ball to get it over the net, that keeps the game going and not allowing one side to delay the game by keeping the ball on one side for too long, so three hits to get it over the net.
Server distance: 6ft away from the net for beginners, and 10ft to 15ft for intermediate/advanced players. Beginners can use palm up serve to hit the ball over the net, intermediate/advanced players can only kick the ball over the net, all serves have to remain inbounds which is inside of the net stands and 15ft from the net, if the defender cannot return the ball over the net the server wins the point, and the server can only score 3pts in a row, then the server has to give the ball to the opposite player, that keeps the game fair and allows the opposite side a chance to serve.