fartlek vs interval

Fartlek training and cellulite

Fartlek training and cellulite

Fartlek training involves the random change of pace while running - anything from sprinting to walking, with random and continuous change of speed every few seconds during your routine. The little known, outside the running world, fartlek training method originated 80 years ago and is a more fun version of interval running - and way better than HIIT (high intensity interval training)…