Here is one of my favorite [tag]baseball practice drills[/tag]. It is an [tag]infielders baseball drill[/tag] where you get four ground balls hit at the same time. This [tag]baseball drill[/tag] gets in a lot of ground ball action with a good throw being required.
Position 4 hitters ([tag]baseball[/tag] coaches) on the foul lines, 2 between home and first, 2 between home and third, at equal distances apart from each other and the base they are closest to. Each of these hitters also have a catcher. 
Position 4 rows of infielders directly across from the hitters, 2 between first and second, 2 between second and third, they should be at a depth close to the outfield grass.
The hitters hit the baseball directly to the infielder across from them, who then fires the ball to thier respective catchers. After they have fielded the ball and thrown to their catcher they peel off to the outside as to not interfere with their adjacent infielder and return to the back of thier line. Meanwhile the next infielder in each line now is prepared to recieve a ground ball and the baseball drill is repeated.
After each infielder has recieved three ground balls they rotate to the catcher position. When catching the ball the catcher should simulate a first baseman’s stretch.The drill is complete after each infielder has been at catcher.
Example, the hitter (coach) on the first base foul line between home and first who is closer to home hits to the third base infielder.
The hitter on the same first base foul line who is closer to first hits to the short stop infielder.
The hitter on the third base foul line closer to home hits to the first base infielder.
The hitter on the same third base foul line closer to third hits to the second base infielder.
This drill gets in alot of ground ball action with a good throw being required.