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.

400 Metres

Botswana's Amantle Montsho Seeks Glory in Punishing Race - The New York Times

The 400 is a Thing of Beauty. No, Really! - The Planted Runner

Why is 400m so hard? - Quora

Holliston boys sprinting toward a TVL track title

The 400 Is a Sprint

Strategy: How to Run the 400m

400 Meter Training: Short to Long, or Long to Short

Sydney McLaughlin-Levrone takes second at 400 meters in Paris - Los Angeles Times

Yelverton World's Top 400-Meter Sprinter Over 60 - The Murfreesboro Pulse