Fartlek is more closely related to Middle distance runners.

- Definition of Fartlek: Fartlek is a training method that originated in Sweden and is commonly used in endurance sports such as running. The term "fartlek" comes from the Swedish words "fart" (meaning speed) and "lek" (meaning play). It refers to a type of training that combines continuous running with intervals of speed work.

- Characteristics of Fartlek: Fartlek training involves varying the intensity and speed of running throughout a workout. It is a flexible and unstructured form of training that allows athletes to adapt their pace and effort based on their current fitness level and goals. Fartlek sessions can be done on various terrains, including roads, trails, or tracks.

- Benefits for Middle Distance Runners: Fartlek training is particularly beneficial for middle distance runners, who typically compete in races ranging from 800 meters to 5,000 meters. Here's why:

1. Improves Speed and Endurance: Fartlek workouts involve alternating between faster and slower running speeds, which helps middle distance runners improve their overall speed and endurance. By incorporating periods of increased intensity, such as sprinting or fast-paced running, athletes can enhance their anaerobic capacity and develop a stronger finishing kick.

2. Enhances Stamina: Middle distance races require a combination of aerobic and anaerobic energy systems. Fartlek training helps develop the aerobic system by encouraging continuous running at a moderate pace. This improves the runner's ability to sustain a steady effort over a longer period.

3. Develops Mental Toughness: Fartlek training challenges middle distance runners both physically and mentally. The ability to push through discomfort and maintain focus during intense speed intervals is crucial during races. Fartlek sessions help athletes develop mental toughness and improve their ability to cope with fatigue and discomfort.

4. Simulates Race Conditions: Middle distance races often involve changes in pace and surges in speed. Fartlek training mimics these race conditions by incorporating intervals of faster running. This prepares runners for the demands of competition and improves their ability to respond to race tactics.

In conclusion, Fartlek training is more closely related to middle distance runners because it helps improve their speed, endurance, stamina, mental toughness, and ability to handle race conditions. This training method allows middle distance runners to adapt their pace and effort during workouts, making it an effective tool for their specific training needs.