Hitting Flaws & How to Correct Them
We all know that coaching hitters involves many actions:

The following are common mechanical errors that should be quickly identified and eliminated.
Flaw: Improper Stance Width
PROBLEM:
The batter's stance is too wide or too narrow. A stance too wide causes a loss of power and prevents hip involvement during the swing. A stance with the feet too close often causes the batter to stride too far or long. This causes the head and eyes to drop during the stride. This makes the hitters success ratio drop tremendously. It is hard enough to hit with a "quiet" head or with no movement. Overstriding makes it even more difficult to see the ball, identify the speed and type or pitch and to hit the ball where it is pitched.

SOLUTION:
Have the batter assume a stance with the feet shoulder width apart. Have the batter take a short stride of no more than 6 inches. If the stance is slightly wider than the shoulders, simply picking the front foot straight up only an inch or two and putting it down may be all the stride the batter needs.

Flaw: Overstriding
PROBLEM:
Overstriding is a common mistake. Batters that often get "jammed" may be in fact causing their own problems by overstriding. Overstriding causes the batter's head and eyes to drop often causing the batter to "loose" the ball during the swing. Tracking the ball visually is made very difficult. The batter's overstriding can also cause the swing to be long. When a batter's feet are too wide it tends to prevent hip involvement during the swing.

SOLUTION:
Batters should use a short or a "no stride" approach. A short stride of 3 to 6 inches is often enough. In fact simply picking the front foot up and putting it back down is all the stride that is needed.

Flaw: "Locking" The Front Arm
PROBLEM:
The batter "locks" or straightens out the front arm when the hands and bat are taken back to the "power" or "trigger" position. This flaw causes the batter to be late starting the swing. It also cause the the bat speed to be too slow and increases the bat's distance to the ball. Locking the front arm also often causes premature wrist roll.

SOLUTION:
Keep a bend in the front elbow. Keep the hands together. Keeping the hand together allows them to work together. Keep the hands close to the body and do not take them back so far that front arm flex is lost.

Flaw: Opening Up Too Soon
PROBLEM:
The front side is opening too soon causing the batter's "whole body" including head and eyes to pull off the pitch. This flaw often causes the barrel to lag and a reduction in bat speed. Much less plate coverage is allowed.

SOLUTION:
Have the batter strive to keep the "knob to belly button" relationship during the swing. The belly button rotates with the knob of the bat. On inside pitches the batter will still "open" but the timing will be perfect. On middle and away pitches the batter will not open or rotate so much. "The belly button to knob" relationship maintains correct timing mechanics.