An experienced school principal in Savanna, Illinois, Andrew Andy Jordan is an alumnus of Western Illinois University with a doctorate in educational leadership with superintendency endorsement and a master of arts in educational administration. Andrew Jordan currently serves as the principal of Donovan High School and co-owns J3 Timing, a company that times races and marathons. Training for a marathon requires dedication. It can take up to a year to prepare, even for regular joggers unaccustomed to a continuous run of at least 20 miles. Finishing relies on endurance, cardiovascular fitness, and the ability to manage and conserve energy. As such, marathon experts recommend talking with a doctor before you start training. First, a person can start running 30 miles a week to prevent injury the first few weeks. Doctors advise that a person run consistently for one year before considering training and participating in a marathon. Then, to increase the mileage and build resistance for a marathon, a person can start running three to five times a week. After becoming comfortable with running on a routine basis, a person can start taking long runs every week or every 10 days. In this way, the body can adjust to longer distances. To mentally and physically prepare for a marathon, participate in 5k or 10k races. Two or three weeks before the marathon, a person can scale down the training and its difficulty so that they do not get too tired. Also, the final week before a marathon should include a lot of rest and no running.