Running Plan Review FIRST 3Plus2 Half-Marathon Training Program
By FIRST — Bill Pierce and Scott Murr Requires purchase Visit plan website
Plan at a Glance
Most half-marathon plans add running days as the weeks get serious. Five days, then six, then seven if you're really chasing a time. The FIRST program does the opposite. Bill Pierce and Scott Murr built it at Furman University around a stubborn idea: three running days a week are enough, if every one of them counts. Two days of cross-training (cycling, swimming, an elliptical session) fill in the cardiovascular work without piling more impact onto your legs.
A half-marathon sits at an awkward distance. It's too long to muscle through on speedwork alone, and short enough that you can't coast to the finish either. Intermediate runners often get stuck in the middle. They run too many easy miles to get faster, or too many fast ones to stay healthy. The plans that work hold a clear line between hard days and recovery days. They treat every running session as a thing with a purpose rather than mileage to file away.
This is the 16-week version for half-marathon runners. Each week, you'll run on Tuesday, Thursday, and Saturday. Tuesday is a track workout (timed reps on a measured loop) and Thursday a tempo run at a steady, comfortably-hard pace. Saturday is the long run. Two cross-training days round out the week. You'll want a recent 10K or half-marathon time before you start, since the workouts assign paces rather than asking you to read your effort.
Below is Buena Vida's full review. We score every plan against the same detailed, 31-point benchmark, with each measure rooted in peer-reviewed sports-science research and proven coaching best practices.
Workouts
Workout names and distances only. Coaching prose belongs to the plan’s author.
Similar plans
Our Review
Sixteen weeks, three running days, and a long run that finishes past race distance. You strike that bargain with the FIRST 3Plus2 half-marathon plan from Run Less, Run Faster (Pierce & Murr). You give it three quality runs and two cross-training days. In return, every running session carries a job and a pace, and that trade only works if you arrive with a recent 10K or half-marathon time.
The week that will define your build is week 13. You run fifteen miles at half-marathon pace plus thirty seconds under fatigue, roughly two miles past race distance. It lands three weeks out from the start line. Hold it cleanly and race day introduces you to no duration your legs have not already met. Everything else feeds that Saturday: Tuesday track intervals at 5K pace across more than ten formats, and Thursday tempo blocks at Short or Mid Tempo.
You take on three demanding days back-to-back from Tuesday through Thursday. A track session, an intervals-style cross-train, and a tempo run land in a row. Wednesday is non-impact, so your joints stay protected, but the cardiovascular load carries through to Thursday. You add your own strength work, because the calendar never schedules it. You also decide what to cut on a flat-legged day, since the plan offers a pace and no effort fallback, and no true recovery week ever arrives.
This plan suits an intermediate runner who already owns a 10K or half-marathon time, can run five to six miles continuously, and genuinely needs three running days rather than five. If you want easy aerobic miles in the weekly mix, or scheduled deload weeks you can plan around, look elsewhere. If you would rather train by effort than chase pace tables you have to anchor yourself, look elsewhere too. Plan on keeping Run Less, Run Faster within reach. The strength chapters, the warm-up sequence, and the pace tables all live there.
-
Structure
Does the plan build you up smartly?
In part. The week-to-week shape stays consistent across all 16 weeks: a track workout on Tuesday, a tempo run on Thursday, the long run on Saturday, plus two cross-training days and two rest days. So you always know the rhythm of the week. What is missing is a formal mesocycle, the lighter down-week the body can plan around. Cutbacks do appear here and there, but Pierce and Murr never label an explicit recovery week or break the plan into named phases, so the load shape is hard to see ahead of time.
-
Prevention
Does the plan protect you from injury?
Not really, and this is the part to read carefully. There is no scheduled recovery week across the 16, and strength work, which keeps a runner durable, is described in the FIRST book but never lands on the calendar. The bigger concern is the stacking. Tuesday's hard track session, Wednesday's cross-training, and Thursday's tempo run put three demanding cardiovascular days in a row before the long run. The running load itself stays controlled, but the week leaves little room to absorb the harder efforts.
-
Flexibility
What happens when you miss a day?
A disrupted week is largely yours to sort out. The plan does name its three Key Runs as the priority, so you know what carries the most weight. But every session is written as a pace target, and if you do not have a recent 10K or half-marathon time, the short, medium, and long tempo paces are abstract numbers with nothing behind them. There is no rule for which session to cut when a week shrinks, and no protocol for picking back up after a missed stretch. You make those calls on your own.
-
Readiness
Will the plan deliver race-day fitness?
Mostly, yes. The race-specific work is well aimed. The Saturday long run reaches 15 miles by week 13, run at half-marathon pace plus 30 seconds, and the Thursday tempo visits 10K pace and longer tempo blocks on a regular rotation. So you arrive at the start line having held race-adjacent effort many times over. The reservation is the taper, the easing-off before race day. It runs only two weeks and stays shallow, which is on the short side for a half marathon.
-
Variety
Are the workouts varied enough?
Yes, this is the plan's standout. The Tuesday track menu rotates through more than ten distinct interval shapes, so no two speed sessions feel the same. The Thursday tempo varies its distance and pace week to week, and the Saturday long runs hold half-marathon pace at different offsets, with one week pulled back to easy effort to keep the plan honest. The one limit is that the three-slot weekly template repeats unchanged for all 16 weeks, so the variety lives inside the workouts rather than in the shape of the week.
Plan Strengths
- By week 13 you've held half-marathon effort for fifteen miles, a couple of miles past race distance. Race day will not introduce you to a duration your legs haven't already carried.
- Swapping two run days for cycling, swimming, or the elliptical keeps your weekly impact load below what a five- or six-day half-marathon plan would put through your joints.
- Across sixteen weeks, the Tuesday interval menu rotates through more than ten distinct shapes (400s, 800s, kilometer reps, mile reps, ladders, pyramids, sets, and mixed reps). The session keeps asking your fitness a new question.
- Each Key Run lists reps, distances, recovery, and a pace target. Effort isn't a thing to negotiate with yourself mid-workout.
- From week 4 onward, Mid Tempo blocks at 10K pace appear in nearly every week, and Long Tempo blocks at near-HMP land in the long run.
Weaknesses & gaps
- Lifting never gets written into the week. Run Less, Run Faster (3rd ed.) devotes three chapters to it. You'll have to translate them into a weekly slot yourself.
- You won't find a scheduled recovery week. Long-run mileage dips at weeks 8, 10, 12, 14, and 15, but the cuts read as opportunistic shaping rather than planned deloads.
- Three sessions land on consecutive days. Tuesday brings a track session, Wednesday an intervals-style cross-train, and Thursday a tempo run. The cardiovascular load is concentrated even though Wednesday is non-impact.
- Pace targets carry every running session. Without a recent 10K or half-marathon time to anchor ST, MT, and LT, the pace labels are abstract and you'll be guessing.
- In sixteen weeks, conversational easy running barely makes an appearance. Warm-ups and cool-downs aside, every running mile carries a pace assignment.
- The plan never schedules a sustained block at half-marathon pace for three or more miles. Race-pace work appears in interval form and at MT or LT in tempo blocks instead.
What this plan does not give you
Lifting never gets written into the week. The Run Less, Run Faster book devotes three chapters to it, so you'll have to translate those routines into a weekly slot yourself. A short session on one of the cross-training days, or Friday before the long run, fits without much disruption. The other gap is recovery. The plan never schedules a true down-week. If a week leaves you flat, treat the long run as conversational and cap Tuesday's track session at one set rather than pushing through. Pace targets carry every running session, and they assume a recent 10K or half-marathon time to anchor them. Without that number, run a tune-up race in the first two weeks rather than guessing at paces that will shape the next four months.
What the science supports
Varied intensity beats steady moderate pace
Tuesday's track workout rotates through ten different shapes across sixteen weeks: twelve 400-meter repeats early on and a pyramid in week 2. Later weeks bring mile repeats, kilometer repeats, and a mixed-rep ladder in week 11. Each rep is held at 5K race pace. Pairing those hard efforts with two easy cross-training days mirrors the research finding that splitting work between clearly easy and clearly hard sessions produces more fitness than steady moderate-pace mileage.
Stöggl & Sperlich 2014; Rosenblat et al. 2019; Casado et al. 2022
Long runs are essential for marathon
The Saturday long run climbs from 8 miles in week 1 to a peak of 15 miles in week 13, which is roughly 1.9 miles past race distance. Most weeks hold half-marathon pace plus 20 to 50 seconds per mile, so the time on feet builds steadily rather than the pace getting faster. Long, sub-race-pace runs are what build the durability your legs need on race day.
Toresdahl et al. 2021; Jones & Kirby 2025; Casado et al. 2019
Race-pace specificity hinges on physiology
Thursday's tempo run (a sustained, comfortably hard effort) is built around what the plan calls Mid Tempo. That's a 3 to 6 mile block held at 10K race pace rather than at half-marathon goal pace. For most runners, half-marathon pace sits well below lactate threshold (the effort where blood lactate starts climbing). Running these blocks at 10K pace lands the work closer to threshold, where the adaptations the workout is reaching for actually take hold.
Pierce et al. 1990; Hewson & Hopkins 1996; Jones et al. 2021
Threshold gains are pace-specific
Threshold work, the harder sustained running that sits at the edge of comfortable, is always done as running in this plan. Thursday's tempo blocks (3 to 6 miles at either 5K pace plus 15 seconds or at 10K pace) are never substituted with cycling or rowing. The Monday and Wednesday cross-training days handle aerobic volume instead. The split matches research showing that running-specific threshold gains require running at threshold, not equivalent effort on a bike or rower.
Tapering improves race performance by 2-6%
The taper runs across the final two weeks. Saturday's long run drops from 15 miles at week 13 to 12, then to 8, then to a 3-mile easy shakeout on race week. Track sessions get shorter (a mixed-rep ladder, then five 1000-meter repeats, then six 400s) but stay at the same 5K race pace. Freshness builds without the legs losing their sharpness.
Train better with Buena Vida
Buena Vida Run Club members get access to a catalog of 250 training plans as part of their membership. Training with Buena Vida offers detailed daily workout notes, integrated nutrition, live voice coaching, weight loss plans, and easy calendar management for life's hiccups.
Try it FREE for 7 days!
Frequently asked questions
- Is FIRST 3Plus2 Half-Marathon Training Program good for beginners?
- No. FIRST 3Plus2 Half-Marathon Training Program is built for intermediate-level runners. A true beginner should start with a lower-mileage plan.
- How many days per week does FIRST 3Plus2 Half-Marathon Training Program require?
- The plan runs on a schedule of multiple weekly runs. See the at-a-glance strip for the exact count.
- Does FIRST 3Plus2 Half-Marathon Training Program include a taper?
- Yes, the plan includes a taper into race week.
- What is the rubric grade for FIRST 3Plus2 Half-Marathon Training Program?
- FIRST 3Plus2 Half-Marathon Training Program grades C on the Buena Vida rubric.