I plan to, over seven days in early October,  run from Wales’s northernmost (Coronation tower near Cemaes in Anglesey) to her southernmost (Rhoose point near Barry). The total distance is 189 miles or 304km before I get lost or distracted but more intimidating than that is the elevation gain and loss of roughly 16,000ft which can be largely attributed to Snowdon's summit sitting firmly in my path on the second day. Each day will consist of around a marathon of running, walking, scrambling and when times are hard, likely limping.