Here's a fun fitness idea: sit on balls and bounce. Not only fun, but this exercise engages your core and abdominal muscles, promoting good posture which is essential for a healthy spine. These balls come with convenient feet that disappear when you're exercising and pop up when you're done to hold the ball in place.
I think these are great fun for a fitness routine. These fantastically strong exercise balls, ideal for a variety of body-toning exercises, are made from a burst-resistant material suitable for even the most rigorous workouts.