good question, maybe they have a rat whisperer to talk to them, you would think that this type of study would be performed on humans, since it's non invasive and non medicated, it's something that is actually good for people, maybe they tried to get some people to do the exercise and couldn't find any volunteers since the majority of people are out of shape couch potato's who think exercise consist of getting up out of bed, well enough of that, what did i do with my remote.