What defines a Fartlek run?

A Fartlek run is characterized by short bursts of speed followed by lower-intensity periods of running. This style of training combines continuous running with interval training, allowing for a variable pace that helps improve speed, endurance, and overall performance.

The concept comes from the Swedish term meaning "speed play," reflecting the athlete's ability to alternate between fast and slow segments. This method of running can be easily integrated into a variety of training environments, offering both physical and mental benefits by breaking the monotony of a standard, consistent pace workout. It’s particularly effective for developing speed and stamina, making it a popular choice among runners who aim for versatility in their training routines.