A stress ball or hand exercise ball is a malleable toy, usually not more than 7 centimetres (2.8 in) in diameter. It is squeezed in the hand and manipulated by the fingers, ostensibly to relieve stress and muscle tension or to exercise the muscles of the hand.
A stress ball or hand exercise ball is a malleable toy, usually not more than 7 centimetres (2.8 in) in diameter. It is squeezed in the hand and manipulated by the fingers, ostensibly to relieve stress and muscle tension or to exercise the muscles of the hand.
Source: Wikipedia "Stress ball" · CC BY-SA 4.0
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