What is so great about a powerball? Some people think there great whilst others don't. Well I was always curious as to what they did, then a friend of mine got one and I was amazed. Amazed that something so small could provide such power and give your arms such a work out without going to the gym.
What does it do? It helps builds strength in wrist, arm and fingers so if you are a musician for example it will improve stamina for using the guitar. If you have arthritis it won't cure it (far from it) but it does help as part of your exercises which is why I have just bought one for my mum. But one very good reason for buying it is it is a lot of fun. Sure the novelty will probably ware off after a while, but while it doesn't trying to get the highest score, especially if your friends have a go can be a good laugh. My friends and I were having a go whilst watching the football and it was hilarious (the facial expressions are worth it alone).
If you want to you can always see if you can make it onto the top 100 powerball scores or, if you feel like a real challenge, go for the world record which at the moment stands at 16,500(ish) revs per minute. The first time I tried I got to about 10,000 and thought my arm was going to fall off.
It is also a great piece of engineering as it doesn't use batteries or anything just centre fugal forces to move. They are also well made have a nice design especially when they light up, even though as one other reviewer mentioned, it does sometimes hurt my little finger as I'm gripping on to tight you may have to alter your grip slightly so that it suits you.
However the best thing about this is the fact that it is very good exercise and yet it is so simple. It may take you a while to get used to how to use it but there are full instructions with it and once you do you won't be able to put it down. The best thing is that you can use it whilst watching the TV or listening to music and this is what I use it for mostly. That way you aren't consciously exercising but still giving your arms a good work out.
So if you need to build up your stamina for typing, musical instruments or as part of a recuperation regime, then this will fit the bill. If your just curious buy it anyway, it's great fun.