A device for exercise or entertainment. The device comprises body that is generally a ring with a cavity. The cavity may hold one or more spherical object, such as metal or plastic balls, within. An exterior portion of the device is clear or translucent, allowing the balls to be observed. A person engages in exercise by wearing the device on an arm or leg and moving the limb causing the balls within the device to move around the cavity of the device. The device may include an opening to allow a person to add or remove balls from the interior of the device.

An improved apparatus for physiotherapy includes a lever arm. A biasing device pivotally biases the lever arm about a pivot axis. There is a support configured for supporting the lever arm above an exercise equipment. A harness is configurable on a torso of a user to couple the user to the lever arm. The pivot axis corresponds to an anatomical longitudinal axis of the user and the torso of the user is biased by the lever arm about the anatomical longitudinal axis.