400 Metres

Athletics, About 400 metres

Michael Johnson Sevilla 1999: Men's 400m world record

2019 World Athletics Championships – Men's 400 metres - Wikipedia

Rules governing Olympic runners send a disturbing message to female athletes, especially those who are Black

Wayde van Niekerk breaks 400m world record to win gold

One-Lap Wonders: Here are Your 400 Meter Runners for Team USA - Women's Running

Michael Norman and Sydney McLaughlin star at world track meet - Los Angeles Times

400 metres hurdles at the Olympics - Wikipedia

400 Meter Training Workouts for Sprinters

Athletics at the 2008 Summer Olympics – Men's 400 metres - Wikipedia