Coach Christensen describes the approach needed to successfully develop the 400 meter runner moving up to the 800 meter event, aka the Type 1 800 Meter Runner.
How to Train the 400-800 Group? – Track Football Consortium
The 800m: Talking Track with Mike Rutt
A long journey of 800 metres
4 Goals of Coaching the 400/800 Meter Athlete - Complete Track and
Track and field - Wikipedia
Training Youth Middle-Distance & Distance Runners (& Doing More
Running On The Track. Everything You Need To Know - Runners Connect
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If runners have different starting positions, then why do they
Middle Distance Training Guide
What is athletics? Know all the track and field events
400 Meter Training Workouts for Sprinters
800 Meter Run: 800m in Track, Sprints and Training – Runnin' for