Instructions Start lying on your back with your heels propped on an exercise ball.

Dirtbag Substitution Prop your heels onto a bench if you don't have an exercise ball.

Use a wobbly exercise ball for increased difficulty.

Do Is on an exercise ball for a bonus core workout while you strengthen your shoulders.

Props You will need an exercise ball.

It took the shape of a sphere of blue-white fire the size of an inflatable exercise ball.

The player maneuvers a translucent sphere - rather like a plastic hamster exercise ball - over airborne ramps and platforms.

Walsh is speaking from his laundry room, where he sits upon an exercise ball, gently bouncing up and down on the screen.

The room was bare except for two large exercise balls.

The room with the exercise balls didn't hold anything else, no furniture or boxes, not even a philodendron on the windowsill.

The latest example is Disney family movie "G-Force", which stars a trio of guinea-pigs with night-vision goggles and motorized exercise balls.

A scene from the Disney family movie "G-Force", which stars a trio of guinea-pigs with night-vision goggles and motorized exercise balls.

"No, you're going too fast." Aiden snagged another exercise ball and joined her on the mat.