Rehearse yardages with Phil's towel drill
The coach recounts that Phil Mickelson used a towel drill throughout his career: he would find a course in the town hosting a PGA Tour event, go to the back nine, and lay out towels every 10 yards, then hit shots to work on those yardages before playing the event. It is described as a way to rehearse specific distances ahead of competition.
Channel: GOLF's Subpar
Watch official source at 8:37Why this context matters
Told during a tour of Arizona State's practice facility, whose distance markers were inspired by this drill.