A fartlek is a fun workout that combines short bursts of fast or intense movement with periods of easier exercise.
The word fartlek comes from Swedish, meaning "speed play." It’s a training method for runners and other athletes in which they alternate between varying intensities of effort in one continuous exercise. Instead of sticking to a strict plan, athletes can sprint when they feel like it and slow down when they need to catch their breath. This mix of intensity levels keeps their run dynamic and engaging, allowing them to listen to their bodies while still challenging themselves.