the country's obesity epidemic. Arnold Schwarzenegger, former Governor of California, was a noted proponent of the game's use in schools. In Japan, celebrities reported losing weight after playing Dance Dance Revolution, which drove sales of the game's home console version. Bemani's testers also found themselves losing weight while working on the game. There is further anecdotal evidence that these games aid weight loss, though the University of Michigan Health System has cautioned that dance games and other exergames should only be a starting point towards traditional sports, which are more effective. Dance games have also been used in rehabilitation and fall-prevention programs for elderly patients, using customised, slower versions of existing games and mats. Researchers have further experimented with prototypes of games allowing wider and more realistic stepping than the tapping actions found in commercial dance games. MIT students collaborated with the government of Singapore and a professor at the National University of Singapore to create AudiOdyssey, a game which allows both blind and sighted gamers to play together. Guitar Hero and related games Guitar Hero games have been used alongside physical therapy to help recovering stroke patients, because of the multiple limb coordination that the titles require. Researchers at Johns Hopkins University have used Guitar Hero III and its controller to help amputee patients, and to develop new prosthetic limbs for these patients. Researchers at University of Nevada, Reno modified a haptic feedback glove to work with the Guitar Hero freeware clone Frets on Fire, resulting in Blind Hero, a music game for visually impaired players that is played with only touch and audio. Guitar Hero was used as part of a Trent University youth sleep study, which showed that, in general, players who played a song were better at it twelve hours later if that period included normal sleep.Guitar Hero and Rock Band have introduced people to rock music and inspired them to learn how to play the guitar. A study by Youth Music found that 2.5 million out of 12 million children in the United Kingdom have begun learning how to play real instruments after playing music video games such as Guitar Hero. The group believes that these video games can be incorporated into music educational programs. Guitar teachers in the US have reported an increase in students who cite Guitar Hero as their inspiration to start learning. On the other hand, industry professionals, such as the