A stress ball can be defined as a malleable toy. It is about seven centimeters in diameter. It is squeezed in the hand and then manipulated by the fingers. This exercise helps a lot in relieving stress as well as the muscle tension. This is also a good exercise for hand muscles.
Many types of stress balls are available on the market, these days. Some of them are available in the form of a closed-cell polyurethane foam rubber. This kind of stress ball is created by injecting
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