With the chair I would get restless legs more. With a yoga ball, I get to bounce and my legs aren’t as restless.” Persinger isn’t the only teacher to rethink her seating arrangement.

Try, for example, to perform ankle hops—a simple bouncy jump on the ball of the foot with heels up. “It’s very simple, but you can’t do it if you don’t have good ankle stiffness,” he says.

Some gently bounce on stability balls. Others rock back and forth on plastic wobble chairs that move like spring animals on a playground. Some sit cross-legged on pillows around a low table.

There's a new game in town: Bubble soccer is bouncing its way to the top as a fun and new way to exercise. Gold's Gym in Woodbridge, Va., is the first in the nation to host the game in a gym setting.