Swedish for "speed play." This is unstructured speed work done during a normal run.
It teaches your body to clear lactic acid more efficiently. 3. Fartleks Running with Speed YIFY
8 x 400m (one lap of a track) at a hard effort. Swedish for "speed play
Increases your body's ability to use oxygen. Running with Speed YIFY
High-intensity intervals burn more calories post-workout. ⏱️ The 4 Pillars of Speed Training
These are repeated short bursts of high-intensity running followed by a rest period.