A ball in means the ball lands inside the court boundaries or touches the line. Lines count as in. Officials judge this carefully. Therefore, visual focus matters. Beginners often assume close balls land out.
During a rally, a hitter attacks near the sideline. The ball clips the line slightly. The line judge signals in. The point counts. Ball in calls rewards precision.
Hitters aim for edges intentionally. Defenders must play until the whistle. Understanding this rule prevents hesitation. Playing every ball builds discipline. The ball in decisions often decides tight points.
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