Fartlek training, also known as "speed play," is a type of endurance workout that was developed in Sweden in the 1930s by a coach named Gosta Holmer. It involves alternating periods of high intensity effort with periods of recovery during a continuous training session.

Fartlek workouts are a popular training method for track and field athletes, as they help to improve speed, endurance, and overall fitness. They can be easily incorporated into any running routine, as they can be customized to fit the specific needs and goals of the athlete. For example, a fartlek workout for a middle distance runner might involve intervals of faster running interspersed with periods of jogging or walking, while a fartlek workout for a sprinter might involve shorter bursts of maximum effort followed by longer periods of recovery.

In addition to track and field, fartlek training can also be beneficial for other sports such as cycling. Cyclists can use fartlek workouts to improve their power and endurance on the bike by incorporating intervals of high intensity effort followed by periods of recovery. For example, a cyclist might alternate between sprinting up a hill and recovering on a flat or downhill stretch of road.

Overall, fartlek training is a versatile and effective method for improving endurance and speed in track and field and other sports. It is a useful tool for coaches and athletes looking to boost their performance and take their training to the next level.

Here is an example fartlek workout that can be completed in a total time of 40 minutes:

This workout can be modified to fit the specific needs and goals of the athlete. For example, the intervals can be made shorter or longer, and the intensity can be adjusted based on the athlete's fitness level. It is important to warm up properly before starting this workout, and to cool down and stretch afterwards.