Abstract: It is accordingly an object of the present invention to enable athletes, mainly baseball and softball players, to learn and practice the proper swing position and develop muscle memory for easy repetition of that position. The invention is of particular utility for indicating to the athlete whether or not each individual practice swing is correct and how to correct and further prevent any errors in form, barring of the lead arm or improper, premature extension of the lead arm or casting, for example. The present invention may be portable and may be used simultaneously with multiple components. The present invention may also comprise a lanyard to enable the user to efficiently practice multiple swings without having to retrieve the training device. The training device comprises one main component and thus avoids complexity and safety issues inherent in the related art. The training device is of shape and comfort to meet the versatile needs of athletes regardless of age or body type.