| 摘要 |
A sport swing training aid for practicing the swing of a ball-hitting device including an elongated rod-like member having a first end for being gripped and a second end remote from the first end representing a ball-striking surface, the rod-like member being hollow and internally corrugated and being capable of producing a tone as air passes through the member during the swinging thereof to produce a tone which varies in length and pitch in direct proportion with the velocity and duration of the movement of the ball-striking end as it is swung through a ball-striking zone, to thereby provide an audible feedback to the player as to the tempo and rhythm of the swing.
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