A person in a boat throws a board to someone in the water.  The person in the water puts the board on their feet.  The person on the boat throws the person in the water a rope and they catch it.  They hold onto the rope and wait in the water.  The boat pulls the person in the water up and they are wake boarding.  The boat pulls another person up out of the water onto a wake board.  The person is jumping over waves in the water behind the boat.