WEST CHESTER, Pa. (AP) — In 11 years of teaching, ditching students' desk chairs in favor of yoga balls is one of the best decisions Robbi Giuliano thinks she ever made.

Replacing stationary seats with inflatable bouncers has raised productivity in her fifth-graders at Westtown-Thornbury Elementary School, making students better able to focus on lessons while improving their balance and core strength, she said.

"I have more attentive children," Giuliano said. "I'm able to get a lot done with them because they're sitting on yoga balls."