With the infield in position hit a ball to the third basemen who makes the throw to first. First base brings the ball home and the catcher throws it back to the third basemen who brings it home again. Repeat the activity around the infield with each new base throwing to the previous one i.e. hit to first comes home back to first then to second third and home again. If proper throws are not made then start the drill again. We have found that this help get the infielders set and used to making good throws.