A multi-functional rotary torso machine is a piece of gym equipment that allows users to target and strengthen their core muscles, particularly the obliques and lower back. This machine typically features a rotating platform or seat that allows users to twist and turn their torso while performing exercises. Some common exercises that can be performed on a multi-functional rotary torso machine include oblique twists, Russian twists, and woodchoppers. These exercises help improve core strength, stability, and overall functional fitness. In addition to targeting the core muscles, a multi-functional rotary torso machine may also have additional attachments or features that allow users to perform other exercises, such as leg raises, knee tucks, or even chest presses. Overall, a multi-functional rotary torso machine is a versatile piece of equipment that can help users achieve a well-rounded workout targeting multiple muscle groups in the core and upper body.