Questions discussing workouts, technique, or cross-training for specific running goals.

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Training running speed going faster at 95-98% or longer at 80%

TL;DR.: For speed training, is it better to run longer at 80% of the max HR, or faster at 95% of the max HR? Long rant: I'm able to run 6Km in 50min if I control my speed based on the HR, by not ...