so that he and his partner have time to run from one end of the pitch to the other before the fielding side can return the ball. To register a run, both runners must touch the ground behind the popping crease with either their bats or their bodies (the batters carry their bats as they run). Each completed run increments the score of both the team and the striker. The decision to attempt a run is ideally made by the batter who has the better view of the ball's progress, and this is communicated by calling: usually "yes", "no" or "wait". More than one run can be scored from a single hit: hits worth one to three runs are common, but the size of the field is such that it is usually difficult to run four or more. To compensate for this, hits that reach the boundary of the field are automatically awarded four runs if the ball touches the ground en route to the boundary or six runs if the ball clears the boundary without touching the ground within the boundary. In these cases the batters do not need to run. Hits for five are unusual and generally rely on the help of "overthrows" by a fielder returning the ball. If an odd number of runs is scored by the striker, the two batters have changed ends, and the one who was non-striker is now the striker. Only the striker can score individual runs, but all runs are added to the team's total. Additional runs can be gained by the batting team as extras (called "sundries" in Australia) due to errors made by the fielding side. This is achieved in four ways: no-ball, a penalty of one extra conceded by the bowler if he breaks the rules; wide, a penalty of one extra conceded by the bowler if he bowls so that the ball is out of the batter's reach; bye, an extra awarded if the batter misses the ball and it goes past the wicket-keeper and gives the batters time to run in the conventional way; leg bye, as for a bye except that the ball has hit the batter's body, though not his bat. If the bowler has conceded a no-ball or a wide, his team incurs an additional penalty because that ball (i.e., delivery) has to be bowled again and hence the batting side has the