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16-Week Marathon Training Plan (mileage-based)

Includes Structured Workouts

Structured Workouts automatically sync with compatible devices and guide you through workouts in real time.

Learn More about Structured Workouts.


Kevin Portmann

All plans by this Coach


16 Weeks

Includes Structured Workouts

Structured Workouts automatically sync with compatible devices and guide you through workouts in real time.

Learn More about Structured Workouts.

Plan Description

All sessions are built to be downloaded automatically from your Trainingpeaks to your Garmin device!

This is a mileage-based plan designed to help beginner and intermediate runners train for a marathon. Athletes who are looking for a plan to get them to the finish of their first 26.2, and more experienced athletes looking for a structured plan will see value with this 16-week (4 months) build to marathon race day.

The program is designed in 4 phases: base, build, peak, and taper. Each phase and each session have a specific purpose, which are described in the pre-comment section of the workout. The athlete will start with ~16 miles in their first week, and will progressively ramp up to reach ~53 miles at the peak of their training.

This plan will help the athlete train methodically and progressively to prime them for their event, with a balanced approach including aerobic, recovery, speed, tempo, and long runs.

This plan includes 2 run tests (5K effort) at week 4 and week 8 to define and refine your training pace. Once you have run your 5K pace, feel free to contact me at to help you determine your training zones. Ideally you are running these 2 tests on the same route, and with a HR monitor.

It is assumed that the athlete has a GPS watch to track their running, and that the athlete has consulted with his/her general practician prior to starting his/her training. Kevin Portmann Coaching is not responsible for ensuring that the athlete has been cleared by a General Practician, nor is he responsible for ensuring that the plan fits the athlete's fitness abilities.

Kevin Portmann Coaching remains available for any question the athlete may have prior to starting this plan.

Kevin Portmann Coaching has availability to take on athletes to offer them a more individualized training program, tailored to their needs, wants, and physiological abilities. The more thorough approach includes, but is not limited to, bi-monthly training plans set up (training scheduled designed 2 weeks in advance), an open communication through TP, texts, and phone calls, a discovery/ onboarding conversation to understand the athlete's work-life balance, training availability, recent and past injuries, areas for concerns, goals, and more.
Feel free to reach out at for any enquiry and get you fully prepared for your marathon event!

How it Works

Load Your Plan

Quickly view upcoming workouts in the TrainingPeaks app.

Workout and Analyze

Upload completed workouts from your favorite tracking app or device.

Track Your Progress

Get feedback, stay on top of your training and perform at your best.

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Training Plan Sample Week


Average Weekly Breakdown

Workouts Weekly Average Longest Workout
Run x5
34mi 16mi
Day Off x1
—— ——
Workouts Per Week Weekly Average Longest Workout
34mi 16mi
Day Off
—— ——

Training Load By Week

This plan works best with the following fitness devices:

Kevin Portmann

Kevin Portmann Coaching

A long distance professional triathlete, Kevin is helping athletes of all abilities reaching their goals in the endurance sports world. Kevin offers 1-on-1 training sessions with athletes residing in San Diego County, and offers triathlon training camps (4-day and 8-day immersions) in San Diego, CA in the winter. Training plans and frequency of communication, adjustments, testing, race selection and race strategy, and so on are tailored to the athlete's needs and availability.

  • This plan includes a Free Basic TrainingPeaks Account.
  • Access your training plan anywhere on the TrainingPeaks mobile and desktop apps.
  • Track your performance with robust data tracking and detailed graphs.
  • Plan for your event in the TrainingPeaks calendar.
  • Track your weight, sleep, hours, fatigue and stress while you train.
  • Syncs daily with other popular apps like Garmin and MyFitnessPal.

Refund Policy

This plan is protected by our Refund Policy and may, with the author's approval, be exchanged for a plan of equal value from the same author.

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