Welcome to your Dorney Marathon Plan! Dorney Lake, situated near the village of Dorney in Buckinghamshire, is a purpose built rowing lake with grounds that are a perfect backdrop to running as well as rowing. The flat course is ideal for a chip timed personal best over the Marathon distance. This is an 18 week intermediate training plan 80/20 training is highly effective and you spend 80% of your time working out at a low intensity and 20% at a high intensity. This method will enable you ...