The Eight Basic Run Types

Fartlek
A fartlek workout is a base run that mixes in intervals of varying duration or distance. It’s a good way to begin the process of developing efficiency and fatigue resistance at faster speeds in the early phases of the training cycle, or to get a moderate dose of fast running later in the training cycle in addition to the larger doses provided by tempo/threshold and interval workouts. They can also serve as a less-structured alternative to a traditional interval session such as a track workout.
Example: 6 miles at natural pace with 10 x 1:00 pickups at 5K pace with 1:00 recoveries mid-run

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