Whenever athletes start a workout program, experienced coaches or trainers always begin with core exercises to provide a great foundation that will help make the other parts of the body stronger.
We can correlate that with building a sound baseball defensive philosophy.
The best defenses in baseball start with great up-the-middle play. Whenever possible the best players on any baseball team should be playing the most challenging positions on the field: pitcher, catcher, shortstop, second base, and center field.
And like the core, if you are strong in the middle the other parts of the team will likely be stronger too. The best teams play championship defense.