From a general standpoint:
- Focus (during & between pitches)
- Control (importance of throwing strikes and staying ahead)
- Basic pitch sequence (ie: when to use off-speed, 0-2 "waste" pitch, etc..)
From a physical standpoint:
- Insure proper grip of the ball (not over-gripping, 2-seam, 4-seam, change up)
- Upper body mechanics: rear extension, elbow height, follow-through
- Lower body mechanics: length of stride, location/angle of front leg
As previously mentioned, one thing at a time so as to not overwhelm and to insure the adjustment has been made.
