Robbi Giuliano teaches her fifth grade class as they sit on yoga balls at Westtown-Thornbury Elementary School Monday, Feb. 4, 2013, in West Chester, Pa. Replacing stationary seats with inflatable bouncers has raised productivity in her fifth-graders at Westtown-Thornbury Elementary School. (AP Photo/Matt Rourke)

Associated Press
Robbi Giuliano teaches her fifth grade class as they sit on yoga balls at Westtown-Thornbury Elementary School Monday, Feb. 4, 2013, in West Chester, Pa.  Replacing stationary seats with inflatable bouncers has raised productivity in her fifth-graders at Westtown-Thornbury Elementary School.  (AP Photo/Matt Rourke)
Robbi Giuliano teaches her fifth grade class as they sit on yoga balls at Westtown-Thornbury Elementary School Monday, Feb. 4, 2013, in West Chester, Pa. Replacing stationary seats with inflatable bouncers has raised productivity in her fifth-graders at Westtown-Thornbury Elementary School. (AP Photo/Matt Rourke)
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