| 摘要 |
A ball comprises a body having an outer surface of sufficient extent to define a volume sufficient to accommodate at least a portion of each of four fingers of a person's hand. The ball has at least one indentation in the surface, the indentation having a depth sufficient to receive at least a portion of four fingers. Each indentation is provided with a gripping surface against which the fingers press while other surfaces of the fingers or the hand engage the outer surface of the ball. In one embodiment, the ball may have only a single indentation, whereas other embodiments the ball has a plurality of indentations. In addition to providing the amusement and exercise device, the ball has uses as a floating safety device.
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