A device for training a baseball/softball player to swing a bat with a positioning apparatus affixed to the bat and a guide component tethered to an adjustable cuff on the upper arm of the trailing arm. Interconnection of guide component and positioning apparatus prevents the hands and bat from casting away from torso through midpoint in the swing and Prevents barrel of the bat from preceding knob end of the bat prior to the point of contact with ball. Positioning apparatus disengages from guide component prior to point of contact with ball allowing player to complete the swing.