Flaw: Stepping too far back with non-pivot foot at start of wind-up.
Result: Pitcher becomes out-of-balance.
Correction: Pitcher should use a very short step back with non-pivot foot (rock back, transferring weight enough to turn pivot foot parallel to rubber).

Flaw: "Rearing back" with upper body and kicking leg out.
Result: Pitcher loses his mechanical efficiency and becomes out-of-balance.
Correction: Pitcher should lift leg so that the upper leg is parallel to the ground.

Flaw: Not coming to balance point over the rubber.
Result: Pitcher "rushes" his lower body forward not allowing his arm to catch up.  This results in HIGH PITCHES.
Correction: Pitcher must come to balance point over the pitching rubber.

Flaw: Failure of throwing hand to get down, back, and up before stride foot touches the ground.
Result: High pitches, loss of velocity, extra stress on pitching arm.
Correction: Slow the pitcher's motion to give pitching arm a chance to get to the highest point as the stride foot touoches the ground.

Flaw: Drive leg is straight when beginning motion toward the plate.
Result: No drive with legs, loss of velocity, and extra stress on the arm.
Correction: Drive leg must be slightly bent to allow it to drive body away from rubber.

Flaw: Lifting stride leg out in front of body (toward plate).
Result: Lack of velocity due to hips prematurely opening, rushing due to lower body getting ahead of the arm, and extra stress on the throwing arm.
Correction: Pull stride knee back so that pitcher can drive off the pitching rubber toward the plate.

Flaw: Elbow dropped, causing fingers to not be directly behind or on top of the ball.
Result: High pitches, loss of velocity, loss of control.
Correction: Elbow must be above shoulder and forearm vertical.

Flaw: Landing with the toe open.
Result: Tendency to open shoulders too quick causing loss of velocity and control.
Correction: Instruct pitcher to come down on the "ball" of the big toe with the toe slightly closed.

Flaw: Landing on the heel of the foot.
Result: Tendency to jar or stop smooth delivery and interruption of natural follow through.
Correction: Instruct pitcher to come down on the "ball" of the big toe with the toe slightly closed.

Flaw: Throwing hand finishes above the knee.
Result: Inadequate follow-through, high pitches, extra stress on the shoulder.
Correction: Hand must finish at point below and outside of knee.

Flaw: Lack of follow through with back leg (Dragging back toe in front of pitching rubber).
Result: Extra stress on the arm, lack of velocity.
Correction: Back leg should "whip" quickly around intoa "fair" fielding position.

Flaw: Front foot landing too far to the right of a straight line running from the middle of the pivot foot directly to home plate (throwing across body).
Result: Inability to produce power from hips and legs, putting undue stress on the arm.
Correction: Make sure pitcher's foot lands close to that imaginary line (allow 6 inches on either side).

Flaw: When following through, not allowing back to bend naturally at waist.
Result: Tendency to be an "arm thrower", causing extra stress on the arm, loss of velocity, high pitches.
Correction: Allow back to naturally follow motion so that it ends up nearly parallel to the ground.

Flaw: Twisting wrist and elbow when throwing a curve ball.
Result: Improper path of curve ball, injury to pitching elbow.
Correction: Pitcher should be instructed to pull the curve ball DOWN!!!

Flaw: From stretch position, taking signal in an unnatural, bent over position.
Result: Muscle fatigue and premature tiredness occurs due to muscle tension.
Correction: Take signal in a comfortable, upright pisition, either with ball in glove or with ball hidden behind back.

Flaw: In stretch pisition, coming to "set" position at or below belt level.
Result: Pitcher is not in an advantageous position to pick runners off base.
Correction: Glove and ball should be held in a comfortable position about chest high.