I learned these [tag]indoor softball drills[/tag] in college, but have used them with high school and 12-U teams.
4 Corner Drill
Divide evenly into 4 corners of the gym (for description purposes, N,S,E,W). Start with 1 ball. N throws ground ball to S, S throws to W, W throws to E, E throws to N. Rotate clockwise after throw.
Add another ball – start opposite position (N to S & W to E), then another. Mastery of this [tag]softball drill[/tag] will yield 4 balls going at once. This is a great drill to end your [tag]softball practice[/tag]. (Players must rotate around to starting position twice).
Safety Considerations: I suggest Incrediballs at first. Make sure rotation occurs around the drill. Do not allow the S line to “cheat up” for the ground ball (watch W to E throw)
Drill emphasis: concentration, accurate throws, footwork, communication (target hands/verbal cue for player receiving next throw is essential with multiple balls), conditioning.*
(*We sprint to next position, and stop to run when a ball is thrown away. After sprints, everyone goes back to their original position.)