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The hand fitness ball can help the elderly relax muscles and stimulate blood circulation, preventing various senile diseases and helping them keeping a clear mind and a healthy body. It has become an essential fitness tool for the elderly. When the elderly play the ball, the kinetic energy generated in the process will be transformed into the electric energy to light up the LED inside. It can serve as a fitness tool and a lighting tool meanwhile. For instance, when an elderly returns home after exercises at night, it can light up the road and escort the elderly home safely just like a guardian angle. It is healthy both for body and for mind.