In the realm of endurance sports training these days, there isn’t a much hotter (or controversial) topic than Zone 2 training. Zone 2 training has long been a training staple for many endurance athletes as it’s historically been touted as the best intensity to train at to induce specific physiological adaptations such as mitochondrial and capillary density. However, recent specific research into Zone 2 training has largely debunked this long-standing narrative. More specifically, it turns the...