What is a defining characteristic of Fartlek training?

A defining characteristic of Fartlek training is the incorporation of varied intensity throughout the workout. This training method, originating from Sweden and meaning "speed play," combines continuous training with interval training, meaning that participants alternate between fast, hard efforts and slower, recovery phases.

This variability in pace can occur over different terrains or in a variety of forms, allowing athletes to push their limits in a more dynamic environment. This adaptability makes Fartlek training particularly effective for improving both aerobic and anaerobic fitness, as well as enhancing a runner's ability to manage changes in pace during actual competition.

In contrast, structured training sessions suggest a rigid framework, which does not align with the flexible nature of Fartlek. While rest periods can be part of various training methods, Fartlek specifically emphasizes the fluid transition between different intensities rather than predefined rest intervals. Lastly, the idea that Fartlek training is exclusive to strength activities misrepresents its focus; it is primarily a cardiovascular endurance training technique suitable for various sports, particularly running.