Day 2 Recap: 2013 Prefontaine Classic - FloTrack
Men's 400m world record holder Van Niekerk tests positive for coronavirus
400 Meter Training - A Scientific Approach
13-Year-Old 47s 400m WORLD RECORD! - YouTube
Strategy: How to Run the 400m
400 metres - Wikipedia
Van Niekerk was on for the record at 300m
RUNNING FORM: THE FASTEST 400M RUNNER IN THE WORLD - YouTube
Michael Johnson Sevilla 1999: Men's 400m world record - YouTube
Fastest High School 400m In 2020 - YouTube
4 × 400 metres relay - Wikipedia
Wayde van Niekerk smashes Michael Johnson's record to claim 400m gold | Rio 2016 | The Guardian
Femke Bol breaks 41-year world record in the women's indoor 400 meters | CNN
Meet Sydney McLaughlin, the 400-m Hurdles World Record Holder | Time
3 Workouts To Help You Run Your Fastest 400-Meter Race - The D10
12-Year-Old Drops Insane 400m Time In Semi Finals! - YouTube
Niklas Klei Sets World Record for Fastest 400-Meter Dash While Wearing Crocs | 2022 Crocs 400-Meters
400 Metres
Best 400 Meter Dash Times of The Opening Finals Roster | Tracking Football
400 METER WORLD RECORD || WHO WILL BREAK IT? - YouTube
Granada Hills' Dijon Stanley equals fastest 400 time in state in 2022 - Los Angeles Times
Rai Benjamin heads to Tokyo Olympics after second fastest 400m hurdles
First-Time Olympian Emma Weyant Posts Fastest Time In Women's 400-Meter IM
400 Metres
Karsten Warholm breaks men's 400 hurdles world record in Norway
Van Niekerk betters 400m world record
Sydney McLaughlin Broke Her Own World Record. Again. - The New York Times
