What does VT2 mean?

VT2 is an abbreviation for the second ventilatory threshold. This is a point on the exercise intensity spectrum that in fact defines high-intensity interval training (HIIT). Training above this point (often called your red zone) is hard and unsustainable for long durations. When we gain endurance fitness, we often see higher levels of the intensity associated with VT2. Other terms used to describe VT2 include the maximal lactate steady state, functional threshold power (FTP), and critical velocity or critical power. In Athletica, we use an algorithmic derivation that approximates the VT2.