This Friday Fartlek Run features 8×4-minute tempo intervals at Level III — a controlled, sub-threshold effort that builds aerobic strength and pacing discipline. Ideal for runners and triathletes preparing for half marathons, marathons, and longer events, this session delivers quality endurance work without excessive fatigue, making it perfect for both early build phases and taper periods.
View More Friday Fartlek Run: 8x 4min Tempo Runs