The Science Museum Strength Ball has been reduced to less than half price at Argos. It is down from £9.99 to £3.49. You will have to check on availability for instore pickup as it is no longer available for home delivery. When I checked five stores close to me still had stocks.
This is something that's fun, but also a great way to build up a bit of strength. Older boys and girls may find it most useful. And grown ups too. My godson has a bit of a problem that means the muscle tone in his arms can be lower than normal, so things like this are particularly good.
According to the website, the ball can make "working out fun, he can get to grips with this quirky strength ball". I don't know why they think only a 'he' is going to be working out. It further describes the ball as an addictive and challenging competitive gadget from Science Museum, and the most enjoyable way to strengthen and exercise your forearm and hand-grip.
To get it working, you switch on the LCD Revometer, and using the pull cord provided, spin the internal gyro. Find out how many revs can you build by spinning your wrists. The record stands at over 14,000 RPM. As the revs build so does the torque, making it a real challenge to control.
It does require batteries - specifically 2 x LR41. The ball is suitable for ages 10 years and over.
Thanks to Babsy Baby at HUKD!