It is no mistake that the worst infielders are typically the tightest and most rigid. All great infielders have a loose rhythm about everything from their footwork, throwing mechanics and hand-eye coordination. They never seem rushed or caught off guard. As I work with infielders I constantly look for ways to improve this quality. It is often seen as an inherent skill instead of a learned skill. I beg to differ.
The infield position is more reaction and instinctive than it is a choreographed movement. Very rarely will an infielder field two hits that are the same pace, hop, or direction. So why train and work to field the standard ground-ball when it never comes? I strive to train infielders improvement in their reaction and ability to adjust to different hops. The partner ground-ball drill does just that.