Hodu borrows its name from the Korean word for "walnut," a reference to the culture's use of the nut as an exercise tool in traditional medicine. The barbell-shaped device is a "zero failure" physical therapy tool, aimed at rewarding patients for even the slightest level of feedback. There are on-board pressure sensors and accelerometers for detecting activity and a series of colored LEDs that light up based on feedback levels. The team behind Hodu is also working on proprietary software to help log patients' squeezing and rotational progress.
After the break is a video that should give you a bit of a better idea of precisely what Hodu is capable of.