Teachers ditch student desk chairs for yoga balls

 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.  By making the sitter work to stay balanced, the balls force muscle eng Photo by
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. By making the sitter work to stay balanced, the balls force muscle eng Photo by
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