Running Plan Review Jack Daniels 5K to 10K Training Plan, 40 to 50 Miles per Week

Does it build you up smartly?

Mostly. It builds in the right order, but each workout comes in a shorthand you have to decode before you run it.

Good training comes in chapters. Each one builds on the last, and the order matters as much as the work itself. Plans built in phases like this tend to beat plans that hold one steady load all the way through.

Daniels gets the order right. Short, fast repeats come first, while you're fresh, to work on speed and form. Longer, harder intervals follow once your legs can handle speed. Threshold running and racing come last, when the race is close. Threshold work shows up nearly every week, and strides run through all 18, so the thread that matters most for a 5K or 10K never breaks.

But the calendar won't hand you a finished workout. Each session is a single line of Daniels' codes for distances, efforts and jogs, so you piece together the warm-up, the hard part and the jogs between repeats yourself, with the pace tables open beside you. The book does say what many of the hard sessions are for, and that helps. It still takes a few minutes with the book before each hard day to know exactly what you're about to run.

Does it protect you from injury?

Many running injuries start suddenly rather than building up over months. On mileage, this plan leaves little room for that kind of sudden spike. On hard days, it leaves more.

Sudden jumps in running load tend to raise injury risk, most clearly when one run goes well past your longest of the past month, and this plan avoids them. Daniels holds the mileage roughly level for all 18 weeks, and each new kind of hard session arrives in an ordinary week, not a big one.

But mileage alone doesn't measure how hard you're training. Pace and intensity add stress that a weekly total misses. From week 7 to week 12, intervals on Thursday are followed by threshold miles on Friday, every week, and in three of those weeks, about 10 miles at marathon effort comes three days before. Your legs get no easy day between the two hardest sessions of the week.

The plan has lighter weeks in weeks 3 and 6, and then none for the last twelve, right through the hardest intervals and into race week. Training load that piles up without relief tends to raise the risk of injury and illness, and on a fixed plan with no coach watching, a lighter week on the calendar is the simplest relief there is. A lighter week can feel like lost ground. After week 6, this plan doesn't give you one, so any easing off is a call you make yourself.

Strength training is the other gap. The book lays out a strength program, but none of it is on the calendar, and finding room for it in a week with a run printed every day is up to you. Strength training substantially lowers sport-injury risk, more than stretching or balance work does.

What happens when you miss a day?

Your paces come from you, not from the calendar. You look up a recent race in the book's tables and get a pace for every kind of run, and each new race updates them. So a disrupted month doesn't leave you guessing how fast to run when you come back. The plan also says where to start, at 40 to 50 miles a week with a recent race in hand.

The easy days give you room too. They're marked optional, the book lets one become a rest day now and then, and it has tables for easing back in after a longer break. When a week falls apart, you can drop easy running first without guilt.

But beyond that, the decisions are yours. Janet Cherobon-Bawcom, a 2012 Olympian at 10,000 meters whom Daniels coached, said of working with him that "instead of trying to talk me out of things, Jack works hard to make the best plan for me, even if it seems crazy." A printed schedule can't do that. The book numbers each week's key sessions in order of priority, but nothing on the schedule says which to drop when only one fits. There's no rule for a missed week either: whether to repeat it, skip ahead, or squeeze the work into the days left. And as printed, the Monday long run falls the morning after a possible Sunday race in the final weeks. You can start the week on any day, but reworking the layout is up to you.

Will it get you ready for race day?

A 5K or 10K is raced close to the top of your aerobic range, and two kinds of fitness carry you through it. One is your threshold, the hardest effort you could hold for about an hour, which sets how long a strong pace lasts before it falls apart. The other is your aerobic ceiling, which hard intervals near 5K effort work on directly. Each sits close to the effort of a 5K or 10K, and for most recreational runners, threshold work and race-pace work are different kinds of training, and either is a reasonable way to prepare.

This plan builds both. Threshold running appears nearly every week, as mile repeats, steady blocks and mixes of the two, and it leads the final phase. Hard intervals fill the middle of the plan and come back in the last weeks. "Physiologically, training at 10k pace is not really better than alternating between threshold and Interval paces in training," Daniels told readers of his coaching company's blog. The long run, capped at 2 hours, is plenty for these distances.

Then the final six weeks change shape. Each weekend, a race can take the place of the Saturday workout, so you could race four, five or six times in six weeks. It's a plan for a stretch of frequent racing, wearing a single-race plan's name. If that's what you want, you get real race practice, week after week.

But there's no taper. The last three weeks look much like the ones before them, and race week still opens with the full long run. Only the midweek threshold session gets shorter. That fits racing often and training through it. If one race matters most, it costs you, because a 1-to-3-week taper improves race performance compared with holding training steady. "There is no evidence to suggest that an 800m runner, or a 100m sprinter for that matter, should be tapering differently than a marathoner," says Iñigo Mujika, a sports scientist who studies tapering. You'd have to build that wind-down yourself.

Are the workouts varied enough?

The range of hard running is wide, and about 85 percent of the running stays easy, so each hard session has room to be truly hard. "I made my easy days a little too moderate and my hard days not hard enough," coach Brad Hudson, a former 2:13 marathoner, said of his own racing years.

Over 18 weeks you run fast 200- and 400-meter repeats, hard efforts from 2 minutes up to 1,200 meters, one-mile threshold repeats, steady threshold blocks, and, unusually for a 10K plan, Mondays of 9 or 10 miles at marathon effort. Each has its own job. Mixing clearly hard sessions of different kinds with plenty of easy running may build endurance better than long stretches of steady, medium-hard running, though the edge looks small.

The short, fast repeats in the first six weeks do something the longer sessions can't. They teach your legs to move quickly and smoothly. Strides carry the same idea through all 18 weeks in smaller doses. A few minutes at the end of an easy run leaves you feeling quicker rather than tired. Strides themselves haven't been tested directly, but short, explosive efforts can make running more economical, so they're a cheap way to keep practicing fast, smooth running. In a small Finnish study led by Leena Paavolainen, well-trained runners swapped about a third of their training hours for short sprints, jumps and light, fast weight work. After nine weeks they ran a faster 5K, though their aerobic ceiling hadn't changed.