What running style is characterized by alternating between jogging and sprinting?

The running style characterized by alternating between jogging and sprinting is known as Fartlek. This term, which comes from Swedish and translates to "speed play," combines continuous training with interval training. It allows runners to vary their pace and effort throughout the course of their run, which can lead to improved speed and endurance. Fartlek training is versatile and can be done on different terrains, making it accessible to runners of all levels. The unpredictability of changing speeds engages different muscle groups and enhances overall cardiovascular fitness, making it effective for building stamina and racing performance.

The other options represent specific types of running that do not incorporate this combination of speeds. Sprints focus solely on high-speed running over short distances, while Base Runs and Long Runs emphasize maintaining a consistent, steady pace over longer distances without the interval element that defines Fartlek training.