Sydney McLaughlin Broke Her Own World Record. Again. - The New York Times
Fastest since 1985, Naser wins women's world 400-meter
What's a good 400m time? For all ages groups
Femke Bol breaks 41-year world record in the women's indoor 400 meters | CNN
Fastest High School 400m In 2020 - YouTube
400 Metres
Brilliant Van Niekerk smashes 400m world record | Reuters
Naser stuns the world with fastest 400m time since East German Koch
Karsten Warholm breaks men's 400 hurdles world record in Norway
400 METER WORLD RECORD || WHO WILL BREAK IT? - YouTube
She once single-handedly won a team track title for UMass Boston, and now her sights are set on the Olympics - The Boston Globe
Men's 400m world record holder Van Niekerk tests positive for coronavirus
Day 2 Recap: 2013 Prefontaine Classic - FloTrack
RUNNING FORM: THE FASTEST 400M RUNNER IN THE WORLD - YouTube
Wayde van Niekerk smashes Michael Johnson's record to claim 400m gold | Rio 2016 | The Guardian
Niklas Klei Sets World Record for Fastest 400-Meter Dash While Wearing Crocs | 2022 Crocs 400-Meters
Track's Most Resilient (and Suspect) Record Is in Danger - The New York Times
12-Year-Old Drops Insane 400m Time In Semi Finals! - YouTube
Michael Johnson Sevilla 1999: Men's 400m world record - YouTube
400 Metres
I came 3rd in the 400m...how can I place 1st next time? 14 year old girl btw - Quora
New York runner sets second-fastest time in nation in 400, does it without starting blocks | USA TODAY High School Sports
Emily Costello runs NCAA's fastest 400-meter time this year, breaking school record | Nevada Sports Net
Granada Hills' Dijon Stanley equals fastest 400 time in state in 2022 - Los Angeles Times
