The Lactate Threshold Block workout keeps it simple with two reps of high intensity running just below your 5K pace, with a lactate threshold tempo in the middle. This is a key session that the top pros use to polish their fitness and help you get race ready. Zwift Academy Run is a world-class training program featuring top-tier coaching for runners of all levels. Complete your journey of structured workouts and group events to unlock your speed, strength, and personal best. Get a closer look at this Zwift Academy Run workout with guidance from coaches Terrence Mahon and Jen Rhines.