Yes, exercising the whole body is good for you.This is a great item that, although wasn't ideal for me, might just be awesome for others. I felt that these were a little large for me.
These are non-toxic, phthalates-free, hypo-allergenic, latex free, chemical resistant, water repelling, heat stable and highly durable, food-grade material and non-porous.
The balls and cord are one full molded piece. There are no seams. The cord between the balls is really stretchy and flexible, so you should not have any problems with it.
The box says the length of this is 8" long. Other measurements are: insertable length: 5 1/4", circumference: 4 3/4", diameter: 1 3/8", weight: 0.4 lbs.
When you hold the balls in your hand you can feel them vibrate. When I first put them in, I could feel them vibrate when I moved, but after a minute or two, that vibrating feeling went away. This could just be me, others might keep that feeling for the full duration of use. When you are holding these, you can hear the little balls rolling around inside them. Once you insert them, you cannot hear it anymore. The shape of the balls are round. This toy can be taken when traveling.
These are the about the same size as the Smartballs, so if one has used them and found them too large then these might be too large also. Size comparison:
Circumference: Little frisky swirled 4 3/4", Smartballs 4 1/2"
Diameter: Little frisky swirled 1 3/8", Smartballs 1 3/8"
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