08931d97_nalized_Paces___Runner_s_World__erceived_Exhaustion_Feels_LIke
[Purpose of Workout] Improve anaerobic threshold and learn to run while fatigued. [Phases] II / III [% Effort] Running rapidly at 80-85%
You're huffing and puffing too hard to talk except in words or very short sentences. It's uncomfortable but sustainable for 3–4 miles and close to 30 seconds slower than your 5K race pace.
Personalized Paces | Runner's World
Perceived Exhaustion Feels LIke