She once single-handedly won a team track title for UMass Boston, and now her sights are set on the Olympics - The Boston Globe
Karsten Warholm runs second-fastest 400 hurdles ever at Diamond League | Sports News,The Indian Express
Big Ten Track and Field Championships at a glance | Star Tribune
43.03 – The Fastest 400m in History – Žiga P. Škraba
USA Track Olympic Trials: Lynna Irby advances in 400 meters
400 Metres
Kenny Selmon Claims National Title in 400-Meter Hurdles, Earns Spot on Team USA - Chapelboro.com
Salwa Eid Naser escapes drugs ban after doping official knocks on the wrong door | Sport | The Times
New York runner sets second-fastest time in nation in 400, does it without starting blocks | USA TODAY High School Sports
Naser stuns the world with fastest 400m time since East German Koch
Matthew Boling runs fastest high school 100 meters in history in 9.98 seconds - The Washington Post
Wayde van Niekerk smashes Michael Johnson's record to claim 400m gold | Rio 2016 | The Guardian
Kadecia Baird of Medgar Evers HS won't represent Guyana in London Olympics despite country's best time in 400-meter race - New York Daily News
400 Metres
Track and field athletes see personal bests and event victories over busy weekend - Daily Bruin
Wayde van Niekerk: Five things to know about the Olympic 400m champion and world record holder
Rai Benjamin heads to Tokyo Olympics after second fastest 400m hurdles
Why The 800 Meter Run Should Be Treated Like The 400 Meter Dash
4 × 400 metres relay - Wikipedia
Karsten Warholm breaks men's 400 hurdles world record in Norway
Dakota State University Athletics - DSU women's 4 x 400-meter relay hit third fastest time in school history at 2021 Drake Relays
4 Goals of 400m Training
Falcons Open Action at Texas Tech - Air Force Academy Athletics
400 metres - Wikipedia
