Place three players in a line with the players spaced approximately
30' apart (closer for younger players). The player at one end of the
line throws to the player in the middle. That player catches the ball
and throws onto the next player using the motion that an infielder would
use when taking a throw from the outfield and relaying the throw to
home plate (arms raised to give the thrower a target, catch the ball on
the glove side, turn and throw as quickly as possible). The player on
the end should apply a tag when receiving the throw. Reverse the order.
Have the players rotate after every few times down the line. You can
have more than three players in the line, just have all the players in
the middle act as relayers.