This 12 week training plan is for beginning duathletes competing in a short distance duathlon up to a distance of a 3.1 mile run, 18 mile bike, and 3.1 mile run. Only minimal fitness is needed before starting this plan. The first week includes five days of training with runs ranging from 10-30 minutes and bike rides of 30-60 minutes. With a maximum week of 6.5 hours of training, you will be ready to complete in your first duathlon in just 12 weeks.