We have 20 strength balls up for grabs courtesy of the Science Museum, worth £10 each!

Strengthen your arm muscles and get a good targeted workout with this nifty little device that’s small, compact and perfect for storing.

All you have to do is pull the red cord to get the gyroscope inside the ball rolling. Then by holding the strength ball and spinning it with your wrist, the revs will build up and improve your arm strength.

With an LCD digital counter that measures the speed and displays the number of revs you’ll be able to keep track of your score and compete with your friends.

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