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Training for your first marathon is one of the most rewarding things you can do as a runner and one of the easiest to get wrong without a plan. The good news: marathon training isn't a mystery. There's a proven framework that's worked for generations of first-time finishers, and we'll walk you through all 8 steps in this guide.
By the end, you'll know exactly how to build your base, structure your weeks, time your long runs, taper correctly, and arrive at the start line ready to finish strong. And if you've already picked your race or you're considering the St. George Marathon as your first 26.2 we've also built a free personalized training plan that generates a custom week-by-week schedule in about three minutes. No email gate, no upsell. Use it alongside this guide.
SGRC's free training plan generator builds a personalized 16 or 18-week schedule based on your goal, fitness, and weekly schedule. Built by coaches who run the St. George Marathon every year.
Build My Free PlanBefore diving into training, assess your current fitness level. Consider factors such as your running experience, recent race times, and overall endurance. Once you have a baseline, set realistic and specific goals for your marathon. Whether it's simply completing the race or aiming for a specific time, clear goals will guide your training and keep you motivated.
Develop a training plan that suits your schedule and aligns with your goals. A well-structured plan typically spans 16 to 18 weeks and includes a gradual increase in mileage and long runs. Consider incorporating cross-training and rest days to prevent injury and aid recovery.
Most first-time marathoners do best with an 18-week build, which gives your body time to adapt to gradual mileage increases without breaking down. If you're targeting a specific race like the St. George Marathon, you can generate a free personalized plan that's already calibrated to the course, your goal pace, and your current fitness saving you the guesswork of building your own.
Begin your training by focusing on building a solid aerobic foundation. This phase involves running at a comfortable pace for longer distances to improve endurance. Gradually increase your weekly mileage by no more than 10% each week to avoid overuse injuries. If you start noticing aches and pains, add in some mobility and strength training before increasing your mileage. Aim for three to five runs per week, including a weekly long run.
As your base mileage increases, introduce speed and tempo workouts to improve your running economy and race pace. Speed workouts, such as intervals or fartleks, involve alternating between fast-paced running and recovery periods. Tempo runs involve sustained efforts at a challenging but manageable pace. These workouts will enhance your speed and build mental resilience.
Long runs are a crucial aspect of marathon training. Gradually increase the distance of your long runs, aiming to cover the marathon distance at least once during training. Include at least two or three 18 to 20-mile runs to familiarize yourself with the physical and mental challenges of endurance running. Practice fueling strategies and experiment with different nutrition options during your long runs to find what works best for you.
The terrain of your long runs matters too. If you're training for a downhill course like St. George, you need to specifically prepare your quads for sustained descent something most generic plans skip entirely. Our SGRC training plan tool progressively builds downhill tolerance starting around week 6, which is the single biggest factor in whether your race ends strong or ends at mile 20.
Incorporate training runs that simulate race conditions. Run on similar terrain, at a similar time of day, and in weather conditions similar to what you expect on race day. This will help you adapt to the specific challenges you may encounter during the marathon and mentally prepare for the race.
This is where a course-specific plan pays off. The St. George Marathon, for example, starts at 5,240 feet, climbs Veyo Hill at mile 7, and drops 2,600 feet into downtown St. George a profile that demands different training than a flat city marathon. If that's your race, get a plan tuned to the actual course rather than adapting a generic schedule and hoping for the best.
In the final weeks leading up to the marathon, reduce your mileage and intensity to allow your body to recover and peak for race day. Tapering helps prevent overtraining and ensures you arrive at the starting line feeling fresh and ready to perform.
A good taper looks different for different runners. Our free training plan handles tapering automatically based on your goal time and weekly mileage so you don't have to guess at percentages or workouts during the most psychologically difficult three weeks of training.
Marathons are as much mental as they are physical. Practice mental strategies such as visualization, positive self-talk, and goal setting to stay focused and motivated during the race. Remind yourself of your training efforts and believe in your abilities.
If you haven't chosen a race yet, here's our case for the St. George Marathon as a first marathon:
The catch? The downhill profile that makes it fast also makes it punishing if you train wrong. Untrained quads start failing around mile 18 to 22, and what should be a celebration becomes a death march. That's why we built a St. George Marathon training plan generator that builds downhill-specific work into your schedule from week 6 onward so your first marathon ends with a finisher photo, not a hobble.
Training for your first marathon takes commitment, patience, and a willingness to trust the process. Follow these eight steps, listen to your body, prioritize rest as much as miles, and the finish line will take care of itself.
If you'd like help executing the plan whether it's getting fitted for the right shoes for the demands of marathon training or joining our weekly Tempo Tuesday runs stop into the St. George Running Center. We've been doing this since 2006, and we love nothing more than walking a first-time runner through their first 26.2.
Your free, personalized St. George Marathon and Half Marathon training plan is three minutes away. Built by SGRC coaches. No signup required.
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