Warmup aid ball

作者: William A. Brant

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摘要: A warmup aid ball having an outer shell, inner weighted core, and a multiplicity of contiguous finger retaining loops in side-by-side lateral arrangement. Each separate loop is attached to the shell at base portion. The portions end are arcuated area where attaches accommodate those digits not retained position eliminate irritation discomfort. slightly displaceable, side-to-side facilitate varying hand sizes.

参考文章(1)
J Hasekian, Sit-up exercise apparatus ,(1971)