A team of researchers from the University of Jyväskylä in Finland found that teenagers who lead an active lifestyle have more gray matter in the cerebellum than their less active peers. The cerebellum, responsible for memory, attention and learning, is an important component of the central nervous system. The results of this study were published in the journal Science Direct. The researchers assessed the participants’ physical fitness by conducting various tests of muscle strength, speed and coordination, including long jumping and running. Magnetic resonance imaging was used to measure gray matter volume in the cerebellum.