About me: Well I'm a famous device that can be both exercise and fun!
The stronger I become the harder it is to dominate me, you wonder how?
The centrifugal force of the ball that occurs while you use it increases along with your strength; the harder you try the harder it will become to keep it in your grip
Here's an example of a beginner, I don't think this person had touched a powerball before
Also, you should know that it's a little tricky getting the movement "right". Some people don't even need to think about it and they have a full grasp of the concept, but for others it takes some practice! It is so easy to get addicted to this
And here's a more dedicated user:
Who I'd like to meet: People that like to exercise while, say... reading a newspaper, or spending time in front of the computer, or watching TV!
You can do anything that requires only one hand. Since the other would be busy working on the powerball!
Powerballs are very flexible regarding choice when it comes down to use. You could use it just for fun, or if you get addicted, you'll probably start competing with friends/family. It is also great for exercise your hand, wrist, forearm, and even you shoulders! It all depends on the position and movement
When can you use it?
Well.. You could use it when you read the newspaper, walk the dog, drink coffee, watch television, walk around the park, and maybe even at work ! (depending on what kind of job you have, of course). The limit for places to use it is your imagination, and of course, any activity requiring both hands.