All you need do is to increase the speed by making a rotational wrist movement and to keep in sync with the spinning of the ball.
The faster you spin the harder your muscles work.
Internal LED bulbs will light up when the ball is in motion.
Simple to start with a pull-string.
Sports Group Wrist Ball with Light & Rope
SKU: 5356
د.ك4.500Price
Only 1 left in stock