Dave Campbell shares some tips to speed-train for marathon running. All runners should develop their speed-skills to enhance recovery and as well enhance efficiency. As a warm up, start an easy run, do some active stretches and drills like low-skip, high-knees, butt-kickers to emphasize different parts of the running form. You can also do short fast sprints to emphasize perfect form and technique. After an extensive warm up, you would run 800 at a prescribed pace and then jog a 400. Being able to complete 10-800 would ensure your completion for a marathon.