With Speed Yify — Running

Swedish for "speed play." This is unstructured speed work done during a normal run.

High-intensity intervals burn more calories post-workout. ⏱️ The 4 Pillars of Speed Training Running with Speed YIFY

Learning to push through discomfort builds grit. Swedish for "speed play

Keeps training fun and mimics the surges of a real race. 4. Strides Running with Speed YIFY

These are repeated short bursts of high-intensity running followed by a rest period.

If you’re ready to start this week, try this routine:

Fast running recruits "fast-twitch" muscle fibers.