Be aware of your limits.The 26.2 miles in a marathon put you at a significantly higher risk for injury than your daily neighborhood jogs.
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Start early:Conventional wisdom recommends that aspiring marathoners run consistent base mileage for at least a year before embarking on a marathon training program.
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Start small:Running a few shorter races—5Ks, 10Ks, or even a half marathon—is an excellent way to prepare physically and mentally for a first marathon.
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Base mileage. Build your weekly mileage over time, running three-to-five times per week.
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The long run.Do a long run every 7–10 days so your body can adjust gradually to long distances.
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Speed work. Practice intervals and tempo runs to increase your cardio capacity
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Rest and Recovery they let your muscles recover from taxing workouts and help prevent mental burnout.
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FuelingYou've probably heard about the phenomenon many marathoners experience right around the 20-mile mark, commonly called "hitting the wall" or "bonking."