I've written about it before and have written ebooks on the subject. But I need to reiterate . . .
Yes, doing your exercises on a swiss ball definitely increases their effectiveness. The instability of the ball causes your body's core muscles to work in order to keep you from falling off the ball.
The result is doing a crunch, for instance, on the ball is a much more effective exercise than doing it on the floor. Not to mention, when you go back to the starting position, being on the swiss ball allows you to go beyond parallel.
Goto Swiss Ball and learn more, but this is definitely not a fad. Use it - you'll love it!
