The saying, 'A year can make a big difference,' holds especially true for Hazelwood West junior Justin Robinson.
At the beginning of January last year, Robinson was a young athlete who was getting his first taste of the indoor circuit. And now, just a year later, he's taken that impressive first start in the 400m and generated significant improvement year-over-year, cutting 1.31 seconds from his time of 48.08 seconds in 2018 to a nation-leading 46.77 in 2019 (above).
Meanwhile, Athing Mu's jaw-dropping 52.55 second performance at The VA Showcase came by virtue of immense competition between freshman Kayla Davis and Kimberly Harris, and there's something to be said about an athlete's best being brought out in a desire to win.
Mu cut 3.31 seconds from her top time in 2018 to 2019.
Wondering where everyone else stands? Check out how athletes improved YOY in the 400m in the links below, or click in the slideshow.
January Improvement YOY: Nation's Top Boys 400m - Overall Best Boys Improvement - Nation's Top Girls 400m - Overall Best Girls Improvement