The Galloway Method is a run/walk method, where you run with walk breaks. So a 3:1 ratio has 3 minutes running and 1 minute walking, it's supposed to help your body recover faster and be less strenuous. Faster runners may want to do 5:1 or more. I'm interested in either the Galloway method, or one that's all walking.
How about if you've never run a marathon? Well, the trick to it is to start training early, you add about a mile in your long run per week.
Anyone else interested? The hard part is waking up in the morning in the weekends, usually either Sat or Sun at 7 am. Having a training group helps you be more accountable and have more support.