Abstract: A bowling practice and/or exercising device in the form of a retaining device for a bowling ball having a wrist encircling strap by which the retaining device is secured to the wrist of a person using the device so that a person can practice and perform various exercises in connection with bowling without the necessity of actually delivering a bowling ball onto a bowling alley or lane. The retainer is in the form of a cage-like structure defined by a plurality of flexible adjustable length straps to receive the bowling ball which would normally be used in actual bowling and an adjustable split wrist band or strap to secure the device to the wrist area of the user with the device being constructed of various materials and including various structural features capable of performing the desired results.