Pfitzinger Marathon Training

Pete Pfitzinger and Scott Douglas's marathon method: high mileage, midweek medium-long runs, lactate threshold work and long runs at a steady pace.

The Short Answer

Pfitzinger training is the marathon system in Advanced Marathoning by Pete Pfitzinger and Scott Douglas. It builds marathon fitness through four things, in roughly this order of importance:

1. Weekly volume - the plans are grouped by peak mileage (up to 55, 55-70, 70-85, and 85+ miles per week in the recent editions), and volume is treated as the main driver of marathon performance.
2. The medium-long run - a second, midweek run of roughly 11-15 miles on top of the weekend long run. This is the signature of the system.
3. Lactate threshold runs - continuous tempo runs at roughly 15K to half marathon race pace.
4. Long runs that are not shuffles - long runs run at a steady aerobic effort (the book gives roughly 10-20% slower than goal marathon pace), with some carrying miles at marathon pace.

VO2max intervals, tune-up races and a three-week taper sit on top of that foundation.

Who it suits: runners who already have a marathon or two behind them, can handle 50+ miles a week without breaking, and want a plan that tells them what to do every day. Who it does not suit: first-time marathoners coming off low mileage, and anyone whose life cannot absorb two long runs a week.

Compared with the systems already in this guide, Pfitzinger uses training paces that look a lot like Jack Daniels', but packages them in a far more prescriptive week, with more volume and more long-ish running than either Daniels or McMillan typically asks for.

Who Are Pfitzinger and Douglas?

Pete Pfitzinger is a former American marathoner and exercise physiologist:

• Won the 1984 US Olympic Trials marathon
• Two-time Olympic marathoner for the United States (1984 Los Angeles, 1988 Seoul), and the top American finisher in the 1984 race
• Trained in exercise physiology and has worked as a coach and sport scientist, much of it in New Zealand
• Wrote a long-running training column for Running Times

Scott Douglas is a running journalist and editor (Running Times, Runner's World) and co-author of several running books.

The books:

• Advanced Marathoning (Pfitzinger & Douglas) - first published 2001, with later editions in 2009 and 2019. This is the source of "Pfitzinger marathon training."[1]
• Road Racing for Serious Runners (Pfitzinger & Douglas, 1999) - the same thinking applied to 5K through half marathon.[2]
• Faster Road Racing (Pfitzinger & Philip Latter, 2015) - an updated take on 5K to half marathon training.[3]

Why the system has the reputation it does: it is the plan many serious amateur marathoners graduate to once they have outgrown beginner plans. Online running communities refer to the plans by length and peak mileage ("18/55", "18/70", "12/70" and so on), which tells you how widely followed they are.

What the reputation is not: proof. There are no controlled trials of Pfitzinger plans against Daniels, Hansons or McMillan plans, and there never will be. What the system has is sound physiology, a coach-author who raced at the Olympic level, and two decades of runners using it. That is a good basis for trusting a plan. It is not the same as evidence that it beats the alternatives.

The Philosophy: Marathon Fitness Is Mostly Aerobic

The marathon is run almost entirely below lactate threshold. A runner who finishes in 3:10 is spending three hours at an effort that depends on:

• Lactate threshold - how fast you can run before lactate accumulates. Marathon pace sits a little below it. See Lactate Threshold.
• Glycogen storage and fat use - whether the fuel lasts to the finish. See Fueling and Nutrition.
• Running economy - how much oxygen each mile costs. See VO2 Max and Running Economy.
• Muscular resilience - whether your legs are still holding form at mile 22.
• VO2max - the ceiling, which matters, but less than in a 5K.

Pfitzinger's plans are built by asking which workout trains each of these, and how much of it a runner can absorb. The answer the book keeps arriving at is: more aerobic volume than most runners are doing, and more of it in long or medium-long runs.

This is the same conclusion the rest of this guide reaches in The Aerobic System. The difference is that Pfitzinger turns it into a specific weekly prescription.

The Workout Types

Advanced Marathoning uses its own names for its workouts. Here they are, mapped to the vocabulary of this guide and to the Daniels paces in VDOT and Pace Tables.

Recovery Runs

Purpose: Add volume and blood flow without adding stress.

• Short (often 4-6 miles) and genuinely slow
• Usually the day after a hard session or long run
• The book prescribes these by heart rate as well as feel, with a low ceiling

Daniels equivalent: the slow end of E pace. McMillan's "recovery run" is the same idea.

General Aerobic Runs

Purpose: The bread-and-butter mileage that builds the aerobic engine.

• Moderate length (often 6-10 miles)
• Easy to moderate, conversational
• Make up a large share of the week

Daniels equivalent: E pace, across its range.

Medium-Long Runs

Purpose: A second dose of endurance stimulus in the middle of the week.

• Roughly 11-15 miles, depending on the plan
• Run at a steady aerobic effort, similar to the long run
• Usually Wednesday or so, placed between the weekend long run and the next one

This is the workout that most separates Pfitzinger from other systems. The reasoning: the adaptations a long run produces (glycogen storage, capillary and mitochondrial development, fat use, leg durability) respond to time on feet, and one long run a week is not much of that. A midweek run of 11-15 miles gives a second, smaller dose without the recovery cost of a second 20-miler.

Daniels equivalent: Daniels has long E-pace runs, but most Daniels and McMillan weeks do not have a separate, named midweek long run. This is extra endurance volume, not a new intensity.

Long Runs

Purpose: Build endurance specific to the marathon distance.

• Build up to 20-22 miles in the higher-mileage plans, with several runs of 18+ miles
• Run at a steady pace: the book's guidance is roughly 10-20% slower than goal marathon pace, starting at the slower end and finishing nearer the faster end
• Some long runs include a block at marathon pace

This is faster than many runners run their long runs. At VDOT 50 (goal marathon pace 7:06/mile from the pace tables), 10-20% slower works out to about 7:49-8:31 per mile. Daniels' E range for VDOT 50 is 8:03-9:04. So a Pfitzinger long run sits at or a little faster than the fast end of Daniels' easy range, and is meaningfully quicker than the "just jog it" long run many plans describe.

That is a deliberate choice, and it is the system's biggest demand on the runner. The steady long run is more marathon-specific, and also more fatiguing. If you cannot recover from it within a couple of days, run it slower; the plan is built on the assumption that you can.

Marathon-Pace Runs

Purpose: Practice goal pace, rehearse fueling, and teach the body to run economically at that speed.

• Continuous miles at goal marathon pace, often embedded in a long run (for example, a long run with a long middle or final section at MP)
• Increase through the build and peak several weeks out from the race

Daniels equivalent: M pace. Same idea, same pace.

Lactate Threshold Runs

Purpose: Raise lactate threshold, which sets the ceiling for marathon pace.

• Continuous tempo runs of roughly 4-7 miles at LT pace, plus warm-up and cool-down
• Some plans use LT intervals (longer reps with short recoveries) as well
• LT pace in the book: roughly 15K to half marathon race pace, which for most trained runners is close to an hour's racing effort

Daniels equivalent: T pace. At VDOT 50, T pace is 6:51/mile and half marathon race pace (1:31:31) is about 6:59/mile, so the two systems point at essentially the same intensity. If you already know your T pace from the pace tables, you know your Pfitzinger LT pace within a few seconds.

VO2max Intervals

Purpose: Raise the aerobic ceiling.

• Repeats of roughly 600m to 1600m
• Run at about 5K race pace (the book describes it as roughly 3K to 5K race pace depending on the runner)
• Recovery jogs of 50-90% of the interval time
• Appear mainly in the middle and later phases, and less often than in a 5K/10K plan

Daniels equivalent: I pace (6:16/mile at VDOT 50, a little faster than 5K race pace). Pfitzinger's guidance and Daniels' land in the same place.

Strides and Speed

Purpose: Keep leg turnover and form sharp without adding fatigue.

• Short accelerations of about 100m, added to general aerobic runs
• Not a separate workout so much as a garnish

Daniels equivalent: R pace in very small doses.

How a Pfitzinger Plan Is Organised

Four Mesocycles

The Advanced Marathoning plans are divided into training blocks (mesocycles), each with a main emphasis. In the 18-week plans:

1. Endurance - mileage and long runs build; LT work is introduced
2. Lactate threshold and endurance - LT runs become a weekly staple; long runs and medium-long runs keep growing
3. Race preparation - VO2max intervals and tune-up races sharpen fitness; marathon-pace work is at its most specific
4. Taper and race - three weeks of reducing volume while keeping some intensity

There are also 12-week versions for runners who start with a solid base, and plans for running multiple marathons close together.

This is the same base, quality, race-specific, taper progression you will find in Progression and Periodization and in the Daniels phases. The difference is the emphasis: Pfitzinger introduces threshold work early and keeps endurance volume climbing much later into the build than a 5K-oriented system would.

The Shape of a Typical Week

The book gives day-by-day schedules; they are not reproduced here. But the shape of a mid-build week in the middle plans is easy to describe:

• One long run at the weekend (16-20 miles)
• One medium-long run midweek (11-15 miles)
• One quality session (LT run, or later VO2max intervals or a tune-up race)
• Sometimes a second quality element (marathon-pace miles in the long run, or a second medium-long run in the highest plans)
• The rest filled with general aerobic and recovery runs, with one rest or very easy day in the lower plans

Most runners notice two things when they first look at it. First, the hard days are fewer and less spiky than they expected. Second, the week is long. There is a lot of running at a moderate, steady effort, and the plan only works if the recovery days are truly easy so the key days get done.

Tune-Up Races

Pfitzinger schedules short races (often 8K to half marathon) in the race preparation phase. They do three jobs:

• Act as a hard, race-specific workout that is hard to replicate alone
• Give you a current fitness reading to set your marathon goal against
• Rehearse race routines: warm-up, pacing, eating and nerves

That second job connects directly to the warning on the Jack Daniels page: a recent half marathon is a far more honest predictor of your marathon than a 5K. The author's own VDOT ladder, a 5K worth VDOT 61.6 against a marathon worth VDOT 55, is exactly the gap a mileage-heavy, long-run-heavy plan is designed to close.

The Taper

The plans taper over three weeks, cutting volume progressively while keeping some intensity so you stay sharp. This is in line with the general evidence on tapering: reduce volume substantially, keep frequency and some intensity. See Recovery and Adaptation and Race Day Execution.

How Pfitzinger Compares With Daniels and McMillan

The comparison page covers Daniels and McMillan in depth. Here is how Pfitzinger fits next to them.

Where They Agree

• Most running is easy or aerobic. All three keep hard running to a minority of the week.
• Threshold work is central. Daniels' T pace, McMillan's tempo, and Pfitzinger's LT runs are the same physiology at nearly the same pace.
• VO2max work is at roughly 5K pace. Same intensity across all three, used less heavily for the marathon.
• Periodize toward the race. Base, quality, specific, taper.

Where Pfitzinger Is Different

The Practical Upshot

• If you like Daniels' paces, you can run Pfitzinger with them. LT is T pace, VO2max is I pace, MP is M pace, recovery and general aerobic runs are E pace. The main adjustment is the long and medium-long runs, which Pfitzinger runs at the fast end of E or a little faster.
• If you like McMillan's calculator, the same is true. McMillan's tempo, VO2max and long run ranges map onto Pfitzinger's workouts without much translation.
• What Pfitzinger adds is structure and volume, not new physiology. If you have outgrown a lower-mileage plan and your marathon lags well behind your shorter races, that is usually the thing you are missing.

And Hansons?

The other plan serious marathoners usually weigh against Pfitzinger is the Hansons Marathon Method, summarised on the comparison page. Both are high-mileage marathon plans with substantial threshold and marathon-pace work. The headline difference is the long run: Hansons caps it at 16 miles and relies on fatigue accumulated through the week, while Pfitzinger builds long runs to 20-22 miles and adds the medium-long run. Neither approach has been shown to be better in a head-to-head trial. Choose the one whose demands you can actually meet.

Who Should (and Should Not) Use It

Good Fit

• Experienced marathoners with at least one marathon done and a consistent base
• Runners whose marathon lags their shorter-race times - the gap that endurance volume closes
• Runners who want a day-by-day plan and will follow it
• Runners who can already handle the plan's starting mileage. The book's own advice is to be able to handle the first weeks of a plan before you begin it, not to use the plan to build up to it

Poor Fit

• First-time marathoners from low mileage. Start with a lower-volume plan or a longer base phase first. See the templates in this guide and Progression and Periodization.
• Injury-prone runners who have not yet tolerated 50+ miles a week. Volume is where most running injuries come from. See Injury Prevention.
• Runners with tightly limited time. A 70-mile week with two long runs is many hours. A well-run lower-volume plan beats a high-volume plan done in fragments.
• Runners focused on 5K-10K. Use Faster Road Racing or a Daniels or McMillan plan instead; Advanced Marathoning is marathon-specific.

Common Mistakes With Pfitzinger Plans

1. Picking the Plan by Ambition, Not History

The plans are grouped by peak mileage. Choose the one whose starting weeks you can already run comfortably, not the one that matches your goal time. Jumping from 40 miles a week to the 70-85 plan is a classic route to injury, and it breaks the 10% rule of thumb on mileage increases by a long way. That rule has weak direct evidence, but a jump of that size is not a borderline case.

2. Running the Long and Medium-Long Runs Too Fast

The prescribed range is already brisk. Runners who drift to the fast end of it (or past it) every week end up turning the system's two endurance days into two extra hard days. Start long runs at the slow end of the range and let the pace come to you.

3. Running Recovery Days Too Fast

With this much volume, the recovery runs are what make the plan survivable. If they creep up to general aerobic pace, fatigue accumulates until a key workout fails. This is the Easy/Hard Rule under load.

4. Treating the Schedule as Sacred

A day-by-day plan makes it tempting to run every mile as written through illness, poor sleep or a niggle. The plans are a framework. Miss a workout and move on; do not stack missed sessions into the next week.

5. Racing the Tune-Ups Into the Ground

Tune-up races are part of the training. Run them hard, then return to the plan. Do not chase a PR in a tune-up 10 days out from the marathon at the cost of the race you trained for.

6. Under-Fuelling the Volume

A high-mileage marathon build costs a great deal of energy. Persistent fatigue, stalled workouts or recurring injuries on a Pfitzinger plan are as often an eating problem as a training one. See Fueling and Nutrition and the section on low energy availability in Injury Prevention.

What the Evidence Does and Does Not Say

Being honest about this matters, because the reputation of the plan can run ahead of the evidence.

Well supported:

• Marathon performance is strongly related to lactate threshold, running economy and VO2max, with threshold the closest predictor among trained runners.
• Higher training volume is associated with faster marathon times in observational studies of recreational runners. Most of the training of successful endurance athletes is done at low intensity (Seiler's work on intensity distribution).[4]
• Tapering by cutting volume while keeping some intensity improves performance.

Plausible but less directly tested:

• That the medium-long run specifically adds something beyond the same mileage in shorter runs. The physiological reasoning is sound, but it has not been isolated in a trial.
• That a steady long run at 10-20% slower than marathon pace is better than a slower long run for most runners. It is more specific; it is also more fatiguing.

Not established:

• That Pfitzinger plans produce better results than Hansons, Daniels or McMillan plans at the same volume. No head-to-head trials exist.

The fair reading: Pfitzinger's plans apply well-supported principles (aerobic volume, threshold work, specificity, tapering) in a demanding, well-organised package. If you can absorb the volume, it is one of the most thoroughly worked-out marathon programmes available. If you cannot, the same principles at lower volume will still work.

Key Takeaways

1. Pfitzinger is a marathon system built on volume - plans are grouped by peak mileage, most at 55+ miles a week
2. The medium-long run is the signature workout - a second, midweek endurance run on top of the long run
3. The paces match Daniels closely - LT is T pace, VO2max is I pace, marathon pace is M pace
4. Long runs are steadier than many runners expect - about 10-20% slower than goal marathon pace
5. Pick a plan by the mileage you already handle, not the time you want to run
6. Recovery days are what make the plan work - keep them truly easy
7. It adds structure and volume, not new physiology - no plan has been shown to beat the others head-to-head

Remember: If your marathon lags far behind your shorter races, the problem is almost always endurance, and endurance is what Pfitzinger trains. Get there gradually, and the plan will do what it is designed to do.

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References

[1] Pfitzinger, P., & Douglas, S. (2019). Advanced Marathoning (3rd ed.). Human Kinetics. - The source of the Pfitzinger marathon plans, workout types and mesocycle structure.

[2] Pfitzinger, P., & Douglas, S. (1999). Road Racing for Serious Runners. Human Kinetics. - The same approach applied to 5K through half marathon.

[3] Pfitzinger, P., & Latter, P. (2015). Faster Road Racing: 5K to Half Marathon. Human Kinetics.

[4] Seiler, S. (2010). "What is best practice for training intensity and duration distribution in endurance athletes?" International Journal of Sports Physiology and Performance, 5(3), 276-291.

[5] Daniels, J. (2013). Daniels' Running Formula (3rd ed.). Human Kinetics. - For the E, M, T and I paces used in the comparisons above.

[6] Wikipedia: Pete Pfitzinger - Biography and Olympic results.

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Next: Comparing Training Systems