One is sitting on the ball for exercise to keep his body in stable
A man prepares to do ab exercises on a fitness ball.
A fitness instructor sits down on an exercise ball in his living room.
A person is showing how to do a stability ball exercise.
A man demonstrates how to do different stability ball workouts for your Abs.
A young man gets ready to show how he uses a yoga ball to practice fitness.
A person is demonstrating stability ball exercises by starting out with sitting on the ball.
A person sits down on a red exercise ball in a garage.
Ab exersize graphic overlay transitions into man walk up to and sitting down on a large round ball.
A man walks over to a stability workout ball and sits on it.