What one of our customers has to say about her Smartballs....
My advice would be to take relaxed approach when using them. The trick is to let your Pelvic Floor muscles do most of the work, which means once they are inserted you don’t need to squeeze your muscles as if you are doing “pelvic exercises”. 
As you become more comfortable with using them you can them move to squeezing gently when they are inserted.
But as you start out the motion of the inner balls moving will be enough to stimulate a response in your pelvic floor muscles, creating small contractions for you.
The reason I chose the Smart Balls is because Fun Factory are known as one of the premium manufacturers of adult products and let’s face it, if I am putting something in my ahem ..”special place” I want to be sure it is safe.
Smartballs these are made from a medical grade (high quality) silicone, which is phthalate free, so these gave me that extra piece of mind I wanted in choosing a pelvic exercise device.
So my final words on the Smart Balls? Not only are these fun to feel move around, but the added bonus is they give you pelvic muscles of steel!
In fact my friend who recommended I try these assures me that using Smart Balls has heightened her orgasms and sexual pleasure. I am looking forward to those side affects soon!