* A few of the nation's top 800m runners (From left: Juliette Whittaker, Roisin Willis, Athing Mu, Calista Segura, Victoria Vanriele)
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Progression is a fluid concept in track and field.
It may not come every race, but when it does it sparks genuine euphoria.
A total of 30 girls have improved at least 20 seconds in the 800m year-over-year, and among the top 50 athletes in the country right now, a total of five have cut at least nine seconds off their best effort over that span.
Calista Segura, a junior from Dallas Wilson High School and Track Dynamite Track Club, has made the most progression among girls under 2:20, erasing 21 seconds off her previous best from a year ago. That's incredible.
We've compiled a host of numbers to review in the girls 800m. Check the links below or follow the navigation.
Index: Top 500 Girls - Nation's Top 50 Athletes' 800m Progression - Overall Progression In 2020 - Breaking Down Country's Top 5 Talents At 800m Indoors