Block signals
What do volleyball players do to hide block signals from the opposing team?
Beach volleyball
Beach volleyball players use hand signals to indicate the type of block they intend to make. Block signals are made behind the back to hide them from the opposing team. They are usually given with both hands by the serving player's partner prior to the serve, with each hand referring to the type of block that should be put up against an attack from the corresponding opponent. A player may also "wiggle" or "flash" one block signal to indicate which opponent to serve to. If the server is the designated blocker, he or she may run up to the net to block after serving. Otherwise, the signaling player will perform the block. Block signals may also be given during a rally while the opposing team is preparing their attack.