BAT LAG is a momentary component that is sandwiched between the SLOT position and the CONTACT position . Bat lag is desirable because it will occur if the hitter times her wrist snap to accelerate the bat head when the acceleration will have the most impact, namely during CONTACT. Bat lag should not be confused with bat drag, which occurs when the hitter prematurely drops her hands and does not "connect" at the SLOT position.
Here are the few moments before the hitter reached bat lag position and the moments from that position to the contact position.
Unfortunately, the terminology is confusingly close, but while BAT LAG is good, bat drag is not. The undesirable bat drag occurs when the hitter's back elbow continues to lead her hands even after the elbow reaches the slot position. IN YOUTH SOFTBALL AND YOUTH BASEBALL, PROBABLY THE MOST COMMON FLAW IS BAT DRAG. As soon as you eliminate "casting," you'll have to deal with bat drag, if the goal is an efficient swing.
The correct motion (no bat drag) is similar to:
Drills that are used to reduce bat drag include:
Here's Sue Enquist talking about overcoming bat drag.
The four positions (or isolated frames) within the linear phase of the swing are:
3. Toe Touch
4. Heel Drop
The five positions (or isolated frames) within the rotational phase of the swing are:
5. Movement to the slot position
6. Bat Lag