Boards
Powerball Gyroscope
Does anyone use one of these?
http://www.amazon.co.uk/Grip-Trainer-Powerball-250hz-Blue/dp/B000GQJZJA/ref=sr_1_2/202-1818912-0640651?ie=UTF8&s=sports&qid=1194875561459&sr=1-2
My boyfriend asked for some weights for Christmas, and from all the product reviews, it sounds quite good, but just wondering if anyone uses one, are they worth getting?