Unlike structured intervals, Fartlek is informal and flexible:
- You vary your pace based on how you feel or the terrain (e.g., sprint to that tree, jog to the next light).
- Improves both aerobic and anaerobic systems.
- Adds variety and keeps runs interesting.
- Great for developing a sense of pace and effort.
Do you enjoy Fartlek runs?"Run free, run fast, then run slow."
