Dustin Johnson is one of the smoothest characters on tour. Whether he's warming-up for the day or walking down the final hole of a major, he looks like he's in a perpetual state of relaxation -- and that was never more true than when I observed him on the range ahead of his first round at the Hero World Challenge last December. 8:01 a.m.: Arrives on range. 8:02 a.m.: Hits first shot. 8:04 a.m.: DJ's caddie AJ forgets iPad for Trackman, runs back to hotel. 8:04 a.m.: DJ picks up Bubba Watson’s lefty club, makes swings. 8:07 a.m.: DJ boasts he can fly it 285 yards with his lefty swing. 8:09 a.m.: Makes more swings, returns to range spot, hits four wedge shots. 8:11 a.m.: Wipes off club, talks to Justin Thomas. 8:12 a.m.: Hits three wedge shots, looks around. 8:14 a.m.: Takes practice swings with Gary Woodland's new club. Watches Woodland hit balls, talks. 8:18 a.m.: Walks with back to his own bag. 8:19 a.m.: Asks what time it is, hits two wedge shots. 8:20 a.m.: Watches Bubba hit a drive, looks at his Trackman numbers, makes fun of his clubhead speed. 8:21 a.m.: Caddy AJ returns with iPad. 8:22 a.m.: Hits wedge, AJ shows DJ funny YouTube video on phone. The pair laugh. 8:24 a.m.: Signs autograph, switches to 7-iron, hits six shots rapid fire. 8:27 a.m.: Pulls driver, hits eight shots rapid fire checking Trackman numbers. 8:30 a.m.: Leaves range.