In a case that a pixel shape in a luma domain is not similar to a pixel shape in a chroma domain in an input image, a prediction image that is generated in the reuse of a luma prediction mode is made more accurate. These stabilized iodotrifluoromethane compositions may be useful as working fluids in multiple applications including cooling apparatus, such as refrigeration, air-conditioning, chillers, and heat pumps. The user engagement device has two different modes of operation selectable by a user for performing different exercises which exercise distinct muscles or muscle groups.