The 400 Is a Sprint

The 400m is a sprint; the 800 is the hybrid. And although speed training for the 400m seems counterintuitive, it should be the priority.

Why is 400m so hard? - Quora

400 Meters

How to run the 400m - Track Star USA

Wayde van Niekerk sets a 400-meter record that no one saw coming - The Washington Post

SPRINT BOATS: It was a wet and wild weekend at the Extreme Sports Park

Sprint (running) - Wikipedia

College track and field: Tech men's sprint relay advances to NCAA final

400m sprint hi-res stock photography and images - Alamy

Van Niekerk betters 400m world record

Texas Relays notebook: Longhorns set meet record in 400-meter relay

400 Meter Training from Supertraining