80/20 Running is Matt Fitzgerald's book about one rule: do about 80 percent of your training at low intensity and the other 20 percent moderate or hard. 80/20 Endurance, the coaching company he co-founded with David Warden, credits him with codifying that split from research on how elite endurance athletes train. Every plan from the book that we review is on this page, 12 in all: a 5K, a 10K, a half marathon and a marathon, each at 3 levels.
Each plan is graded on the same 31 measures we use for every plan, Buena Vida's own included, with the research behind each measure linked. The ladder is strict. A C is a decent plan with gaps worth knowing about, and a D is either bare bones or has issues that you might want to avoid. Open any plan to see what it does well, where it falls short, and who it suits.
- Plans reviewed
- 12
- Goals
- 5K, 10K, Half Marathon, Marathon
- Length
- 9–18 weeks
- Run days
- 6–7 a week
- Peak mileage
- 20–76 miles a week
5K plans
Your first structured 5K, mostly easy running, nine weeks.
BeginnerRequires purchaseFor 5K runners ready for two interval days plus a long run each week.
IntermediateRequires purchaseTwo-a-day 80/20 build for a sharper, faster 5K.
AdvancedRequires purchase10K plans
Your first or fastest 10K, built on mostly-easy running.
BeginnerRequires purchaseIntermediate 10K plan, six runs a week on the 80/20 method.
IntermediateRequires purchaseTwo-a-day 10K build for competitive runners chasing a PR.
AdvancedRequires purchaseHalf Marathon plans
A gentle, mostly-easy first half marathon over 15 weeks.
BeginnerRequires purchaseFor runners ready to push half marathon training up a notch.
IntermediateRequires purchaseFor competitive runners ready to train twice a day.
AdvancedRequires purchaseMarathon plans
A gentle first marathon build on the proven 80/20 method.
BeginnerRequires purchaseSix runs a week to sharpen an already-solid marathon base.
IntermediateRequires purchaseFor advanced marathoners ready to train twice a day.
AdvancedRequires purchaseTraining with 80/20 Running
Fitzgerald's case starts with a habit many runners will recognize. He argues that the typical recreational runner does less than half of their training at low intensity and gets stuck in what he calls the moderate-intensity rut, where every run lands at the same medium effort. His answer is to slow down on most days so the few hard days can be truly hard. The research is on his side: most runners improve more when easy days stay easy and hard days are clearly hard.
The plans have no pace table. You find your threshold heart rate with a 30-minute time trial or a simpler talk test, set 5 effort zones from it, and run by heart rate, feel or matching paces. Each week states its own split, close to 90/10 in the base weeks and 80/20 later. Workouts are numbered rows in the book's tables, so keep the book nearby. You can also swap many easy runs for a ride, a swim or other cross-training, most of all at Level 1.
The levels follow what you already do. Level 1 asks for aerobic exercise 6 times a week, at least 3 of them runs, and keeps Monday off. Level 2 asks for exercise every day, some faster running and easy runs of 6 to 8 miles. Level 3 asks for easy runs of 7 to 10 miles and two runs a day on some days, and its biggest marathon weeks reach about 76 miles.
Eleven of the 12 plans earn a C. They're strongest at getting you ready for race day and at mixing the hard work: the Level 1 marathon plan brings 7 kinds of hard session across its 18 weeks. The gaps sit around protection. None of the schedules includes strength work, and the book says little about what to do when something starts to hurt or a week goes sideways. The one D, 5K Level 1, also more than doubles your running in week 2, and sharp jumps in weekly running raise the risk of injury. The book's cross-training swaps keep that jump small if you take them.
These plans suit a runner whose easy days keep drifting toward medium, anyone who trains by heart rate or feel, and cyclists or swimmers who want to keep at it. If you've been hurt in the past year, read the reviews closely and plan to add strength work yourself.
Get more out of your running with Buena Vida
Buena Vida was built by a runner to bring the whole job of training into one place: a plan that fits your schedule and your fitness, coaching on every run, and food targets that keep up with the work you do. Members get personal training & nutrition plans, plus full access to the catalog of pre-written plans for every running goal.
In research studies, runners on plans fit to them improved as much as or more than runners on fixed plans, and fewer of them stalled.
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