In some examples, a device to facilitate prevention or alleviation of a repetitive motion disorder may include a physical interface and a motor. The physical interface may include a size, a shape, an orientation, and a position. The motor may be operably coupled to the physical interface. The motor may be configured to automatically change at least one of the size, the shape, the orientation, or the position of at least a portion of the physical interface ergonomically and repeatedly during use of the device to facilitate prevention or alleviation of the repetitive motion disorder.