Place teams along opposite end-lines. Game starts with the coach serving a ball in, closer to one side than the other, and calling a number. Players with that number enter the grid. Then call a second number. Players with that number enter as second attacker and second defender.
Players then return to the line.
Continue, varying attackers and defenders and combinations of players. Some hints are listed below. Larger Group Scrimmage Expand the field to accommodate 6v6 and let them play. Watch the defenders, but save the comments for the end. Hints Circle Game Keep the passers moving.