Options:
Beginner 400/800m training (0-20km/week current running)
Intermediate 400/800m training (20-50km/week current running)
Advanced 400/800m training (50+km/week current running)
Options:
Beginner 400/800m training (0-20km/week current running)
Intermediate 400/800m training (20-50km/week current running)
Advanced 400/800m training (50+km/week current running)