80/20 running is very simple. It has two components: planning and monitoring. The planning component entails creating or choosing a training plan that is based on the 80/20 Rule. In other words, the plan should be set up so that roughly 80 percent of your total training time is spent at low intensity (below the ventilatory threshold) and the other 20 percent is spent at moderate to high intensity. The monitoring component entails measuring intensity during each run to ensure you are executing your 80/20 plan correctly.
