Apparatus and method for training a baseball batter to swing a baseball bat level

A baseball bat swing training device for training a batter to swing a baseball bat level, the baseball bat swing training device comprising:

• a baseball bat coupling for attachment to a baseball bat;
• a line having a first end, a second end and a total length, the second end of the line attached to the baseball bat coupling;
• and
• a single-unit line controller configured for attachment to a horizontal structure that is vertically over the head of the batter and to vertically hang from the horizontal structure so as to be over the head of the batter, the single-unit line controller retaining both the first end of the line and an excess length of line of the total length of line, the single-unit line controller adapted to vary and to fix a working length of line of the excess length of line, the working length defined as from the single-unit line controller to the baseball bat coupling;
• wherein the single-unit line controller varies and fixes the working length of line by receiving, storing and releasing the excess length of line from itself;
• and
• wherein the single-unit line controller comprises:
• a line reel;
• a clamp;
• and
• whereby the fixed working length of line limits swinging of the baseball bat connected by the baseball bat coupling to the fixed working length of line by the batter to not below a level baseball bat swing.