NEW You can now listen to Fox News articles! Exercise is widely known to benefit the brain , and researchers at Penn State recently uncovered a surprisingly mechanical reason: Each time the body moves, the brain gets a kind of "rinse." According to a study published in Nature Neuroscience, the secret to this internal wash cycle may lie in the abdominal muscles. In mice models, the researchers found that the brain is mechanically linked to the abdomen through a network of blood vessels that functions like a hydraulic system. FITNESS EXPERT REVEALS SIMPLE RULE TO GET IN SHAPE WITHOUT DREADING THE GYM: 'JUST MOVE' "Every time the mice contract their abdominal muscles — like when they walk — blood moves from the abdomen into the spinal canal," said lead study author Patrick Drew, professor of engineering science and mechanics, neurosurgery, biology and biomedical engineering at Penn State, in a press release.…