Running Plan Review Runner's World 20-Week Marathon Training Plan

Does it build you up smartly?

A marathon plan has a lot of weeks to fill, and the good ones give each stretch a job. Easy miles come first, building the aerobic engine. Race-specific work follows once your body can take it. Plans that shift their emphasis like this tend to beat plans that keep the load constant, whichever model of phases they follow.

Runner's World gets that order right. Five weeks of easy running lead into the Wednesday goal-pace runs, which grow by a mile every few weeks, from 2 to 5. The long run grows alongside them. The phases are labelled on the calendar, so you always know which part of the build you're in, and the 2 biggest weeks land late in the build, where they belong.

But the Wednesday notes are thin. A few of the early ones tell you why you practice goal pace. From week 13 on, they carry only the workout: warm up, hold goal pace, cool down. You run the biggest sessions on trust.

Does it protect you from injury?

Partly. The plan's advice on injury is good, but the schedule doesn't always follow it.

Sudden jumps in running load tend to raise the risk of getting hurt. Part of the reason is likely timing. Your blood and muscle energy systems tend to adapt within a few weeks, while tendons take weeks to a few months and bone longer still, so you can feel fit before your legs are built for the extra miles. Lorraine Moller, an Olympic marathon medalist from the Lydiard school, puts it as a golden rule: "you can never progress faster than your slowest part will allow."

The plan's notes know this. In week 2, and again in week 8, they warn that you may feel like you can run longer, and tell you to stick to the schedule anyway. But the schedule makes its own steepest climb in weeks 5 and 6. A fifth run arrives, the long run grows, and in week 6 your first goal-pace run lands on top of it all. Those same weeks start a pattern that runs through week 11: Friday, Saturday's long run, Sunday and Monday are all run days, four in a row wrapped around the longest run of the week, in a plan whose rest days are one of its best features.

The build also goes a long time without easing off. Weeks 8 and 16 are clearly lighter, but the plan's week 12 cutback runs only a mile less than week 11. That leaves 7 weeks, from week 9 to week 15, with no real lighter week, and it's the same stretch where your long run doubles from 10 miles to 20. A fixed plan needs relief built in, since load that piles up without a break tends to raise the risk of injury and illness, and that stretch is where you'd want it most. How much lighter is enough? Robert Chapman, who coached Team Indiana Elite, didn't mind if his runners' easy days drifted a little faster in a down week. He was "less concerned about that than dropping mileage 20 percent." Week 16 clears that bar easily. Week 12 doesn't come close, so if your legs feel worn by then, make that week lighter yourself.

Strength is the other gap. The plan recommends it 2 to 3 times a week and defines its rest days as no exercise at all. So the strength sessions have to share a day with a run, and the plan never says which days, or what the sessions should be. That's a real loss, because strength training lowers injury risk more than stretching does. In 2021, marathon great Eliud Kipchoge and his training partners did their strength work twice a week, and he didn't lift weights. "The exercises are not something where you suffer," said Marc Roig, the physiotherapist who oversaw the routine. "We know the important part is running." This plan's easy-run days could hold two light sessions like that, but you'd have to place them yourself.

What the plan does well is teach you to read your own body. A note in week 8 explains how to tell soreness from injury: stiffness that fades as you warm up is probably soreness from your last hard run, but pain that gets worse as you run may be an injury, and the note tells you to back off and see a sports-medicine doctor if it doesn't settle. That matters, because early evidence, from footballers rather than runners, suggests a lingering low-grade ache may raise the risk of a full injury that stops you running. Easing off for a few easy days when an ache lingers is a sensible precaution.

What happens when you miss a day?

Some. The schedule has room to move, but when a week goes sideways, the decisions are mostly yours.

It never says which runs matter most. Every run on the schedule carries the same weight, so in a short week there's no guidance on whether to protect the Wednesday goal-pace run or the long run, or what to let go first. Nothing covers a missed week either, so if you lose most of one, working out how to rejoin the schedule is on you. The plan's help comes in small pieces. A note in week 6 says that if you get no sleep the night before a hard workout, rearrange the week and run easy instead. Another, in week 9, tells you to adjust the plan to how your body feels.

But the schedule has room to bend. Tuesday and Thursday are off every week, and from week 12 Sunday is too, so a missed run has somewhere to go. And with never more than 1 hard run a week, moving it a day doesn't crowd another hard session. Few runners hit every session, and they don't need to. Coach Pete Pfitzinger and writer Scott Douglas offer a rule of thumb: "if you can do 90 percent of the planned training schedule, your preparation is going well." With at least 2 days off every week, this plan gives you room to reach that mark even in a messy week.

The plan also teaches as it goes. Its daily notes explain how easy days should feel, how to hold your form running up and down hills, and how to tell ordinary soreness from the start of an injury. By race week you know more than the calendar alone could tell you.

Will it get you ready for race day?

A marathon asks 2 things of you: covering the distance, and holding your goal pace once you're tired. This plan prepares you for both.

The distance comes from the long run, and marathoners who train with longer long runs do tend to race better, though no study has tested whether shorter sessions could stand in for them. Here it builds from 8 miles in week 6 to 20 in week 15, steps back to 14, then reaches 20 again in week 17. That's two 20-milers, the second about 3 weeks before the race. The plan suggests starting that last one at the time your race will start, so race morning already feels familiar when it arrives.

Goal pace comes from Wednesdays. The 2 miles in week 6 become 3, then 4, then 5, and the plan holds the 5-mile block into the first week of the taper. Across 13 of these sessions, you get plenty of practice at the rhythm you mean to race at.

Then the plan lets you rest. The taper runs 3 weeks: the miles come down in week 18, the goal-pace run drops away in week 19, and race week is three easy 3-mile runs before Sunday. A taper of up to 3 weeks, with fewer miles and some faster running kept in, improves race performance compared with not tapering, and this one is well shaped. Bill Pierce, a co-founder of the FIRST training program, watched the marathon taper grow over his career. "When I first started out in the 1970s, we only did a six-day taper for our marathons," he said. "Now the conventional wisdom is three weeks, and that makes sense to me." This plan gives you the full 3 weeks. The last long run, 8 miles in week 19, doubles as a rehearsal for how you'll pace the race.

Are the workouts varied enough?

Not very. For 13 weeks, every hard session is the same run at goal marathon pace, and nothing else on the calendar asks your legs to move fast.

That matters more than it first appears. For most recreational marathoners, goal pace sits below threshold, roughly the effort you could race at for an hour. So the Wednesday run and threshold work are two different kinds of training. Either is a reasonable choice for a recreational marathoner, and no study shows one beats the other, but this plan only ever offers the one. For trained runners, mixing mostly easy running with a few clearly hard sessions may build endurance a little better than steady, moderate running, and the hard days here never go past moderate.

There are no hill sessions on the calendar, though the notes coach you on hill form, and no strides, the brief pickups to a fast, smooth stride at the end of an easy run. Short, explosive work can make runners more efficient, though strides themselves haven't been tested directly, and strides cost almost nothing. Running coach Jason Fitzgerald calls hill sprints his favorite sprint workout, writing that they "can make you less prone to injury, increase your power, and improve your running efficiency." This plan has neither, so a few hill sprints or strides after one easy run a week are yours to add.

What the plan gets right is the easy running. Almost 9 of every 10 miles are easy, at a pace you could talk through, and that easy volume is the base that carries the harder work and lets your body adapt to it. Runners who like routine will also find Wednesdays simple to plan around: the same run, a little longer every few weeks.