Look, I get it. Running slow makes you faster? It sounds counterintuitive, which is why most novice runners go too hard/too fast/too soon. I seems logical to think that the harder I run, the faster i’ll get. And so it goes, we want to finish every run gasping for air to make us feel “like we got a workout”.
Structure In Your Training Improves Capacity
Structured training is all about repetition and specificity. In executing a training plan, we're throwing specific and repetitive workload at the body in order to convince it to make physiological adaptations. In basic terms, the desired adaptations are increasing the body's ability to do work for longer and at higher intensity for reduced physiological cost