The Norwegian method focuses on lactate threshold training. Here are training principles and sample workouts from 12 world-class runners.

According to one research paper, the best training for long distance running performance comes from tempo runs and short intervals, which, along with easy runs, leads to high mileage. Find out how to put it all together.

Optimize your training intensity distribution by following the principles of threshold training used by Jakob Ingebrigtsen and his brothers.