Running Plan Review Running Your First Marathon
By Running Your First Marathon — Andrew Kastor Requires purchase Visit plan website
Plan at a Glance
A first marathon is as much a leap of faith as a physical test, and this plan is built to take the guesswork out of it. Andrew Kastor lays out twenty weeks of exactly what to run each day, the same program he gives thousands of runners training for the LA Marathon. His guiding idea is simple: total miles and consistency matter more than any single workout.
Kastor is an Olympic marathon coach who guided Deena Kastor and Ryan Hall at altitude in Mammoth Lakes. His plan builds an easy aerobic base for six weeks. Then it adds one weekly workout, a set of Yasso 800s or a goal-pace tempo, next to a growing weekend long run. Reduction weeks come every third week, the long run peaks at eighteen to twenty miles three weeks out, and a proper taper carries you to the line.
It suits a runner who already trains and wants a first marathon done right. Despite the title, this is not a couch-to-marathon plan. Week one assumes you already run twenty-five to thirty-five miles a week, and the speed work starts early. The strength routine and fueling detail that round out the program live in the book's chapters, not on the daily calendar.
Below is Buena Vida's full review. We grade every plan on our 31-point benchmark, built from peer-reviewed sports-science research and proven coaching best practices.
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Our Review
As a first-marathon plan this is about as complete and well-built as they come. You get the fundamentals done right: a patient aerobic base and a steadily climbing long run. Reduction weeks absorb the load, and a three-week taper sets up the race. You leave very little to chance.
The pacing is its quiet strength. A half-marathon time trial in week fourteen sets your goal marathon pace. From there the Yasso 800s, goal-pace tempos and simulation runs teach your legs what race effort feels like. Add full chapters on gear, fueling and race day, and you have a genuine coach on the page.
The honest catch is the audience. It is sold as your first marathon, but it is really a first marathon for someone who already runs. Week one assumes you already run twenty-five to thirty-five miles a week, and the early speed work would sink a true beginner. The plan is also simple, with one workout a week and a peak near forty-five miles that is modest for twenty weeks. Read the strength and nutrition chapters, because they are not on the calendar.
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Structure
Does the plan build you up smartly?
Mostly. The plan runs a clean base into a build into a taper, with reduction weeks every third week to absorb the load. It is sound and easy to follow. What keeps it from the top is its plainness; three broad phases and a single weekly workout, without the finer shaping a more advanced plan brings.
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Prevention
Does the plan protect you from injury?
Largely. Reduction weeks every third week, easy-heavy running and well-spaced hard days keep the load in check. The thing to watch is the step up when workouts begin after the week-six cutback, which asks a fair bit at once. Strength work sits in a chapter rather than the daily plan, so staying resilient is partly down to you.
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Flexibility
What happens when you miss a day?
This is where the plan is most accommodating. Every run is set by effort and goal-pace offsets rather than fixed splits, so a heavy day just runs easier. Miss a workout and you skip it rather than cram, since only the week's total really matters, and a clear rule guides your return from injury. Little here is a number you can fail to hit.
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Readiness
Will the plan deliver race-day fitness?
The plan points everything at race day. A half-marathon time trial sets your goal pace, then goal-pace tempos, Yasso 800s and marathon-simulation runs rehearse that exact effort for weeks. The long run climbs to eighteen or twenty miles three weeks out before a full taper. You reach the start line having practiced the pace and the distance both.
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Variety
Are the workouts varied enough?
For a first-marathon plan the workout menu is unusually full. Easy runs and a weekly long run anchor it, while Thursdays rotate through Yasso 800s, goal-pace tempos and marathon-simulation runs. A half-marathon time trial adds a real test mid-plan. Only the quiet base weeks repeat one simple shape.
Plan Strengths
- A full chapter each on gear, fueling, injuries and race day makes it a coach on the page rather than just a schedule.
- Clean base, build and taper periodization, with a reduction week every third week to absorb the training.
- A real goal-pace system of Yasso 800s, tempos and simulation runs teaches your legs the marathon effort.
- The long run climbs sensibly to eighteen or twenty miles three weeks out, then a proper taper freshens you.
- Setback and flexibility guidance is explicit and forgiving, with a clear return-to-running rule after injury.
Weaknesses & gaps
- Billed as your first marathon, it actually assumes a twenty-five to thirty-five mile base and early speed work, so a true beginner would struggle from week one.
- Hard training is sparse, with a single Thursday workout through most of the build.
- Peak volume near forty-five miles a week is modest for a twenty-week plan and an intermediate base.
- Strength and nutrition live in the book's chapters, never as entries on the daily plan.
What this plan does not give you
This plan is the running; the coaching around it stays in the book. The biggest gap is who it is for. Despite the first-marathon title, it assumes you already run twenty-five to thirty-five miles a week. It also starts speed work within weeks, so a genuine beginner should build a base first. The full strength routine and the detailed fueling and gear advice each get a chapter. But none of it is written into the daily plan, so you fold it in yourself. And the pace targets are all relative to a goal marathon pace you set from a mid-plan time trial, not a calculator that hands you exact splits. Read the chapters, because they are half the program.
What the science supports
Easy miles do most of the work
Nearly every mile of the opening six weeks is run easy, well under race effort. Kastor is building the aerobic base marathon fitness rests on, and the science on endurance training backs that priority. Filling the week with easy miles develops a bigger, sturdier engine than packing it with hard sessions does. He lays that foundation before a single fast workout.
Haugen et al. 2022; Casado et al. 2022; Tønnessen et al. 2014
Long runs are essential for the marathon
The weekend long run stretches out week by week, toward eighteen or twenty miles, and it carries the whole plan. Nothing shorter or quicker prepares you for the marathon the way hours on your feet do. That steady accumulation of distance is what lets your legs and your mind last through the final stretch of the race.
Toresdahl et al. 2021; Jones & Kirby 2025; Casado et al. 2019
Recovery weeks turn training into fitness
Every third week the mileage eases off by design. Those lighter weeks give your body room to turn the training into fitness, clearing the fatigue and rebuilding a little stronger before the next block. Chasing miles straight through instead tends to end in staleness or injury, so Kastor writes the rest into the schedule.
A taper makes you 2-6% faster on race day
The final three weeks pull the training right down. Dropping the volume while keeping a touch of intensity lets deep fatigue clear and your fitness rise, and a well-judged taper reliably sharpens race-day performance. Twenty weeks of work only shows up if you arrive rested, which is exactly what these last weeks deliver.
Fuel your training or the gains stall
The long runs double as fueling rehearsals, with drinks and gels taken on a set schedule. That is not a minor detail, because getting enough carbohydrate and fluid both fuels the training and is a skill the marathon punishes hardest. A first-timer who has practiced eating and drinking on the run is far less likely to come apart late.
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Frequently asked questions
- Is Running Your First Marathon good for beginners?
- No. Running Your First Marathon is built for intermediate-level runners. A true beginner should start with a lower-mileage plan.
- How many days per week does Running Your First Marathon require?
- The plan runs on a schedule of multiple weekly runs. See the at-a-glance strip for the exact count.
- Does Running Your First Marathon include a taper?
- Yes, the plan includes a taper into race week.
- What is the rubric grade for Running Your First Marathon?
- Running Your First Marathon grades C on the Buena Vida rubric.