The SPINAID is a training device perfect for any baseball player wanting to improve throwing efficiency. The device is the size and weight of a regulation baseball with two flattened sides. When thrown, the flattened parallel sides provide instant visual feedback to help players of all skill levels better understand ball flight, movement, and rotation. An inefficient delivery is present when the device appears to wobble when thrown. The visual feedback provides an athlete means to improve their throw through experimentation and self-directed learning. Athletes can use the device to learn how to apply different finger pressure, grip, and release, to their delivery, improving efficiency in real-time.