What type of aerobic training involves varying pace and terrain during performance?

Fartlek training is a notable form of aerobic training that incorporates variations in pace and terrain during a workout session. The term "fartlek," derived from Swedish, translates to "speed play," reflecting its core principle of blending continuous training with interval training. In a typical fartlek run, an athlete may alternate between different intensities, such as sprinting for a short duration followed by a slower recovery pace. This can also include incorporating various terrains, such as running uphill and downhill, which enhances both aerobic endurance and strength.

This training method is particularly effective for improving both aerobic capacity and speed, allowing athletes to adapt to the changing demands of different race conditions. It promotes improved cardiovascular fitness, as it requires the body to adjust quickly to varying levels of exertion. Additionally, it adds variety to training sessions, which can help maintain motivation and reduce the monotony often associated with standard training routines.