4 × 400 metres relay - Wikipedia
Wayde van Niekerk smashes Michael Johnson's record to claim 400m gold | Rio 2016 | The Guardian
Gardiner goes into men's 400m final with fastest time - The Nassau Guardian
Femke Bol breaks 41-year world record in the women's indoor 400 meters | CNN
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
Michael Johnson Sevilla 1999: Men's 400m world record - YouTube
Best 400 Meter Dash Times of The Opening Finals Roster | Tracking Football
Niklas Klei Sets World Record for Fastest 400-Meter Dash While Wearing Crocs | 2022 Crocs 400-Meters
Emily Costello runs NCAA's fastest 400-meter time this year, breaking school record | Nevada Sports Net
Rai Benjamin heads to Tokyo Olympics after second fastest 400m hurdles
Is it possible to run a 400 meter race in 1 minute? - Quora
400 metres - Wikipedia
Meet Sydney McLaughlin, the 400-m Hurdles World Record Holder | Time
400 Metres
Fastest since 1985, Naser wins women's world 400-meter
400 Metres
Track's Most Resilient (and Suspect) Record Is in Danger - The New York Times
Brilliant Van Niekerk smashes 400m world record | Reuters
Men's 400m world record holder Van Niekerk tests positive for coronavirus
Day 2 Recap: 2013 Prefontaine Classic - FloTrack
Naser stuns the world with fastest 400m time since East German Koch
Fastest High School 400m In 2020 - YouTube
Karsten Warholm breaks men's 400 hurdles world record in Norway
12-Year-Old Drops Insane 400m Time In Semi Finals! - YouTube
Van Niekerk betters 400m world record
