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Stress ball for exercising hands and arm muscles. |
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Stress Ball for Exercising Hands and Arm Muscles |
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Use this stress ball to test your strength and exercise your upper body. The stress ball is very similar to the popular Powerball. |
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| VAT included price. |
| $26.73 |
| 19,95€ |
| £16.96 |
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Stress balls are commonly referred to by the name of the brand that first made them popular: Powerball. The Powerball a gyroscopic device designed to exercise arm muscles (especially the muscles around the wrists) and are often used in physiotherapy. They are also used to exercise the upper body in general.
The Powerball was designed based on León Foucault’s gyroscope, which was first created in 1852 in order to demonstrate how the Earth rotates. Gyroscopes work thanks to the principle of centripetal force. The rotor inside gathers more and more force depending on how fast you turn the ball.
The faster you turn the ball, the greater number of revolutions the rotor will generate. As the rotor revs up, it will make an increasingly higher pitched whistling noise. These stress balls don’t require electric power or batteries. They can reach up to 8,000 rpm.
The Powerball is normally used to exercise muscles in the hands as well as forearms, biceps, triceps and shoulder muscles. Its use is highly recommended as a means of strengthening the arms in preparation for sports such as golf, tennis, rowing, etc.
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| Stress Ball for Exercising Hand and Arm Muscles |
| Includes the stress ball and a little rope to make it move |
| Size: 6 cm x 6 cm |
| Can reach up to 8,000 r.p.m |
| User’s manual comes in Spanish, Italian, French, English, German and Portuguese |
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Language English [
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