Abigail Renfrow dropped 4.27 seconds from 2018 to 2019.
The fictitious character of Dominic Toretto (AKA Vin Diesel) famously said: "I live my life a quarter mile at time. Nothing else matters." Likewise, this list includes a similar mindset.
And yes - I did use a cheesy movie line as the intro to the girl's 400 Leap of the Year...
On that note: Who drops over 14 seconds from their 2018 personal best?
Isabel Gaines, that's who.
The Lamar sophomore clearly figured out how this quarter-mile thing goes, because she dropped a staggering 14.20 seconds from her 2018 best, which was leap years beyond anyone.
A year ago Gaines ran her one and only 400 of the season, and it was a modest 1:16.96 effort. She came swinging into 2019, however, as she ran between 1:02.76 and 1:03.98 every time she stepped to the track.
Two more made gains of over six seconds, which in the 400, that's quite a chunk of time.
Chasey Blach and Rhys Maxey both surpassed with the mark, with Blach taking this one in a lean over Maxey. Blach went from 1:09.20 in 2018 to 1:02.42 this year for a leap of 6.78 seconds, while Blach was just a hair behind, going from 1:08.15 to 1:01.96 for a leap of 6.19 seconds.
What's additionally impressive is that Blach and Maxey only competed in the 400 twice this year.
All in all, 16 girls within the Top 200 made leaps of over four seconds in the 400 this year.
Editor's Note: List compiled with the Top 200 times from 2019.