Students in Robbi Giuliano's fifth grade class sit on yoga balls as they complete their assignments at Westtown-Thornbury Elementary School Monday, Feb. 4, 2013, in West Chester, Pa. The exercise gear... more 
Students in Robbi Giuliano's fifth grade class sit on yoga balls as they complete their assignments at Westtown-Thornbury Elementary School Monday, Feb. 4, 2013, in West Chester, Pa. The exercise gear is part a larger effort to modernize schools based on research linking physical activity with better learning, said John Kilbourne, a professor of movement science at Grand View State University in Allendale, Mich. (AP Photo/Matt Rourke) less 
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Associated Press | Photo By Matt Rourke
Wed, Feb 20, 2013 3:18 AM EST