CO-REC ONLY D. Men and women must alternate positions in the rotation order. E. Substitutions must be male for male and female for female. In Co-Rec, when the ball is played more than once by a team, a player of each sex must play the ball before it crosses the net. A ball, except a service , striking the net and going over is still in play. The ball may be played when any part of it has crossed the top of the net.
Any ball touching a boundary line is good.
A player may step on the centerline, but not entirely over it . B. A player shall not contact any part of the net or its supports while the ball is in play. When the ball is driven into the net so that it causes the net to contact an opposing player, this is not a foul if they did not actually contact the net by their own impetus. In the act of blocking, players may reach across the net but may not contact the ball until the opponent has completed their offensive attack on the ball. The ball must be clearly hit.