Use a bunker line to check low point
Use a line in sand as a low-point feedback station. Make swings that enter the sand at the back edge of the line, then use the lowest point of the divot as immediate feedback on where the swing bottomed out.
Channel: Danny Maude
Watch official source at 4:48Why this context matters
Done in a bunker; the sand acts as a low-cost feedback tool ('this is your TrackMan').