It’s a seemingly simple task: bounce a ping-pong ball on a wooden paddle. So simple that almost anyone can pick up a ball and a paddle and make a reasonable job of it. Now, close your eyes an… ...

A new grant from SEF provides for stability balls (shown here) in all the first-grade classrooms at Franklin School in Franklin Elementary School in Summit.  A new grant from SEF provides for ...

Whether students or adults are sitting on traditional chairs or using core strength to balance on exercise balls, she said, everyone needs to stand and move around after 20 to 30 minutes of sitting.

THE BOTTOM LINE Sitting on an exercise ball burns more energy than sitting on an office chair, but the evidence that it improves posture is lacking. scitimes@nytimes.com.

See It This Gaiam ball chair features a removable, multi-use 52-centimeter exercise ball, available in five colors. The entire unit measures 24 inches tall and 22 inches wide, with the option to ...