Abstract: A training bat for increasing the speed of the swing of a baseball batter. The training bat includes a tubular body with a first end including a grip and a sealing knob. A second end of the body includes a cavity therein with a detachable pin. The cavity within the tubular body includes a plurality of core members of various weights. A batter can vary the weight of the training bat by securing a selected core member within the cavity using the detachable pin. The pin may include a flexible clip member or a strap including hook and loop layers thereon for connecting a core member within the training bat. A knob boot extends from the knob and around the first end of the tubular body. A selected core member secured by the pin is held in a non-rotatable relationship with respect to the tubular body.

Abstract: An instructional device for training a user to hit a ball. The device includes an elongate handle portion for being gripped by the user, and an elongate body portion extending from the handle portion. An enlarged diameter ball-striking sleeve is carried by the body portion and defines a hitting zone within which the user attempts to make contact with the ball. A sleeve-adjusting surface is formed with the ball-striking sleeve for moving the sleeve along the length of the body portion between a plurality of hitting positions. Friction holds the ball-striking sleeve in a selected one of the hitting positions as the instructional device is swung by the user.