After unpacking the question is: why I bought that thing ... Printing reinforced when the first tests I did not launch the craft. And then a little research on google, two video views later I finally heard the purr magic ball. Both say it is therefore necessary to test to understand the usefulness of the powerball. After 6 months of tendinitis I could, in a week, finally find the strength in the arm and fills chance I can now shake a hand without fear of evil (those include tendinitis).