What do the terms "jogging, sprints, and rest intervals" refer to in Fartlek training?

The terms "jogging, sprints, and rest intervals" in Fartlek training specifically refer to the concept of speed play. Fartlek, which is Swedish for "speed play," is a training method that combines continuous training with interval training. This approach alternates between fast and slow paces, incorporating both jogging and sprinting, while also including periods of rest or slower recovery. This dynamic structure allows the athlete to experience varying intensities throughout the session, which can enhance cardiovascular fitness, speed, and endurance. Therefore, the focus on mixing different speeds and recovery makes it distinctly aligned with the principles of speed play.