Abstract: A bat swing training aid includes a body having a generally cylindrical profile that includes a first portion and a second portion, the body being selectively attachable to a barrel of a bat and having a selectively adjustable weight value. A clamping member is disposed between the first portion and the second portion, the clamping member having an unclamped position and having a clamping position where the body is in contact with the barrel of the bat. An inner surface defines an inner diameter that is selectively adjustable in response to the clamping member being in the clamping position. One or more weight retainers are disposed around a portion of the inner surface corresponding to the first portion. Each of the one or more weight retainers is arranged to receive a weight element having a defined weight value.