Jim Ryun breaks his own world record in the mile at the AAU Championships in Bakersfield, California.

The AAU (Association of American Universities) National Field and Track Championship in Bakersfield, California. James Ronald 'Jim' Ryun participates in the 1 mile event. An official in a stand with a sign that reads 'Bulova Photometer'. Officials, coaches and team members inside the track. Spectators in the stadium. Ryun crosses the finish line. He is congratulated by other runners. Photographers take pictures. He breaks his own world record for the mile. He shaves two-tenths of a second for a 3:51.1 performance with a final quarter-mile of 53.5 seconds.