The 90/30 fartlek is one of them: 90 seconds of strong running followed by 30 seconds easy, repeated over several kilometres.

The 30-20-10 workout blends low, moderate and high-intensity intervals to improve VO₂ max, strength and running performance – ...

There is no question that as a people, runners included, we do not move nearly enough. Even those training for long-distance races often live otherwise sedentary lifestyles, says Michele Stanten, a ...