Marathon preparation requires enough repeated running to build endurance without treating any single plan, mileage target or progression rule as universal. Research can describe patterns used by trained runners and associations between workload and injury, but it cannot prescribe one safe schedule for every runner. Experience, health, recent training, recovery and race goals all change what is appropriate.
This guide is general educational information, not a diagnosis, treatment plan or individualized exercise prescription. Recent surgery, pregnancy, chronic illness, medication concerns, significant symptoms and return from injury require advice from an appropriately qualified clinician.
Start from the training you can already sustain
A marathon plan should begin from current, repeatable training rather than from the mileage shown in a generic calendar. Reviews of highly trained distance runners describe substantial training volume, but those populations are not a safe template for a novice or a runner returning after time away.
No peer-reviewed review establishes a universal starting mileage or a rule that every runner should add the same percentage each week. Evidence connecting week-to-week workload changes with injury remains limited and methodologically inconsistent, so progression should respond to individual tolerance rather than a fixed formula.
Evidence: PMID 35418513 · PMID 30534459
Use intensity distribution as a principle, not a prescription
Reviews of trained middle- and long-distance runners commonly report that most training is performed at lower intensity, with a smaller share of threshold or high-intensity work. The exact distribution varies across studies, events and training phases, and the findings largely come from experienced athletes.
For a recreational marathoner, the defensible takeaway is to avoid making every run hard. How many faster sessions are appropriate depends on training history, total workload and recovery; the reviews do not support one mandatory weekly pattern for every runner.
Evidence: PMID 35418513 · PMID 29182410
Build long-run capacity without relying on a 10 percent rule
Longer runs are event-specific preparation, but research has not established a single longest-run distance or progression rate that minimizes injury for everyone. Sudden changes in distance, speed or frequency may matter, yet the available injury literature is too heterogeneous to turn that association into a universal percentage rule.
A practical plan therefore changes one major stressor at a time, preserves easier recovery periods and adjusts when fatigue or pain is not resolving. This is an evidence-aware risk-management approach, not a guarantee that injury will be prevented.
Evidence: PMID 30534459
Practice fueling and hydration before race day
Sports-nutrition guidance supports matching carbohydrate, fluid and overall energy intake to the athlete, session and environment. It does not support one menu, gel count or fluid volume for every marathoner, and medical conditions or gastrointestinal problems can materially change appropriate choices.
Use training to test familiar foods and fluids that are tolerated during longer efforts. Individualized quantities should come from a qualified sports dietitian or clinician when health, medication, disordered-eating risk or persistent symptoms make general guidance inadequate.
Evidence: PMID 26920240
Know what the evidence cannot decide for you
Much marathon-training research describes competitive or highly trained runners and cannot establish that the same volume or intensity is appropriate for beginners. Injury studies also differ in definitions, follow-up and measurement of training load, which limits precise risk estimates.
The cited reviews cannot determine whether vigorous marathon training is appropriate for a particular person with an injury or health condition. That individual decision is outside the populations and outcomes studied and requires information that a general training guide does not contain.
Evidence: PMID 35418513 · PMID 30534459
Common questions
Frequently asked questions
How many miles per week are required for marathon training?
Research does not establish one required weekly mileage for every marathoner. Appropriate volume depends on current training, experience, recovery and goals; elite-runner volumes should not be copied as a beginner prescription.
Should marathon mileage increase by 10 percent every week?
The 10 percent rule is not a validated universal injury-prevention rule. Available workload studies are too inconsistent to prescribe one percentage, so changes should be individualized and reassessed when recovery deteriorates.
How many hard workouts should a marathoner do?
Reviews support the broad pattern that trained distance runners perform most work at lower intensity, but they do not establish one mandatory number of hard sessions for all runners.
What should a runner eat or drink during marathon training?
Sports-nutrition guidance favors individualized carbohydrate, fluid and energy strategies that are practiced in training. A single product, quantity or schedule is not appropriate for everyone.
Can this evidence determine whether marathon training is medically appropriate?
No. The cited training and injury reviews describe groups of runners and study methods; they do not assess an individual’s health history or establish personal medical readiness for vigorous marathon training.
Peer-reviewed evidence
References
- Training Periodization, Methods, Intensity Distribution, and Volume in Highly Trained and Elite Distance Runners: A Systematic Review.. International journal of sports physiology and performance (2022). PMID 35418513. DOI 10.1123/ijspp.2021-0435.
- The Effect of Periodization and Training Intensity Distribution on Middle- and Long-Distance Running Performance: A Systematic Review.. International journal of sports physiology and performance (2018). PMID 29182410. DOI 10.1123/ijspp.2017-0327.
- IS THERE EVIDENCE FOR AN ASSOCIATION BETWEEN CHANGES IN TRAINING LOAD AND RUNNING-RELATED INJURIES? A SYSTEMATIC REVIEW.. International journal of sports physical therapy (2024). PMID 30534459.
- Position of the Academy of Nutrition and Dietetics, Dietitians of Canada, and the American College of Sports Medicine: Nutrition and Athletic Performance.. Journal of the Academy of Nutrition and Dietetics (2016). PMID 26920240. DOI 10.1016/j.jand.2015.12.006.