You wouldn't draft a letter or sketch a still life with an ink-stained finger, but that's what writing or drawing on a tablet amounts to without the proper tool.

WSJ: The Pen Is Mightier Than the Swipe

Flaws in an athlete's form can be noted by drawing on the screen and easily seen by both coach and athlete using the large screen a tablet provides, and without the need to disturb the camera setup.

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