An easy way to visualize this: imagine a long-handled flashlight is used as a bat. Hold the flashlight at the end near the light. Begin a swing. If you swing with your hands inside the ball you’ll notice that the first motion of your hands shines the beam of light toward the pitcher. In contrast, if you swing out or away the beam of light shines toward your body.
Shine the light of truth on your swing. Keep your hands close to your body and inside the baseball. Light up the pitcher and light up the scoreboard!
From October 2010, http://raisingahitter.wordpress.com