16-Week Half Marathon Training Plan (Advanced Level)

Plan Overview

Target Audience: Runners with multi-year training history who hold a 45+ mpw base year-round Goal: Half Marathon (13.1 miles) in 16 weeks, sub-1:25 territory and faster Weekly Mileage: 50-80 miles (peak 80) Running Days: 6-7 per week, with 1-3 doubles per week in the heaviest blocks Experience Required: Have raced the distance before, have done structured threshold work, and can absorb a 20-mile long run without needing three days to recover from it

This is the advanced sibling of 16-Week Half Marathon Training Plan (Intermediate Level). It is not that plan with bigger numbers. The difference is structural: threshold work appears in two distinct forms, marathon pace becomes its own stimulus rather than a garnish on the long run, the long run itself carries quality, and volume is carried partly by second runs. If you are not already comfortably holding 45 mpw before Week 1, run the intermediate plan. Starting this one from a 35 mpw base is how you end up injured in Week 7.

Before You Start

Establish your VDOT (do not guess your paces):
- Use a recent all-out race: 10K or half marathon is ideal, 5K is acceptable
- Convert it in VDOT and Pace Tables to get real numbers for every zone below
- Re-test roughly every 6 weeks. Training off a stale VDOT is the fastest way to turn every workout into the wrong workout.
Know your zones by name. Every session in this plan is prescribed by zone, never by a raw pace:
- Easy (E): Conversational. The bulk of the plan. Should feel almost embarrassingly comfortable.
- Marathon (M): Steady, controlled, "all day" effort. Roughly 15-20 sec/mile slower than Threshold.
- Threshold (T): Comfortably hard. The pace you could hold for about an hour if forced. Roughly 15K to half marathon race pace for most runners at this level.
- Interval (I): Hard. About 3K-5K race effort. Used in 2-5 minute bouts.
- Repetition (R): Fast and short. Mile race pace or quicker, with full recovery. Neuromuscular, not aerobic.
- Go to VDOT and Pace Tables to convert these into your actual minutes per mile. Do not borrow a training partner's paces.
Audit your base honestly:
- 8+ consecutive weeks at 45+ mpw before Week 1
- No unresolved niggles. This plan has no slack in it for you to rehab an injury inside.
- A long run of at least 13-14 miles already in your normal rotation
Schedule your races:
- Goal half marathon on the Sunday of Week 16
- Tune-up 10K on the Sunday of Week 12 (recommended, not optional at this level - it calibrates your race-pace assumptions before the final block)

Training Philosophy

The half marathon is a threshold race. At 1:25 and faster you are running at or just under your lactate threshold for the entire event, which means the single fitness variable that most determines your time is the pace you can hold at that threshold. Everything in this plan is either developing threshold, supporting it aerobically, or protecting the top end that sits above it.

Training Phases:

Weeks 1-4: Base and strength. Volume up, strides and hill sprints, no formal threshold work yet.
Weeks 5-8: Threshold introduction. Continuous tempo and cruise intervals alternate. M pace enters the long run.
Weeks 9-11: Threshold density plus a VO2max touch. Peak volume (80 miles) in Week 11.
Week 12: Down week and 10K tune-up race.
Week 13: Race-specific. Half marathon pace becomes the target of the hardest sessions.
Weeks 14-16: Three-week taper. Volume falls sharply, intensity is retained.

Key principle: volume is the substrate, threshold is the sharp edge, and the long run is where both are made to matter at once.

What Makes This Plan Advanced

Doubles: when a second run helps, and when it is junk

A double is a second run on the same day, usually 3-6 easy miles, most often in the evening after a morning run. Doubles exist for one reason: they let you carry more weekly aerobic volume than your body can absorb in single sessions without pushing any individual run to the point where it degrades the next day's quality. Running 13 miles in one go on a Wednesday between two hard days costs you far more than running 8 in the morning and 5 at night, even though the total is the same.

A double helps when:

You are above roughly 65 mpw and the alternative is a single run so long it compromises the next workout
It is genuinely easy. Second runs are aerobic filler, not a place to feel good and press.
It falls on an easy day, not on a quality day and not the day after a long run
It buys you a recovery-paced session on tired legs, which is a real and useful stimulus (running well when already fatigued is a marathon and half marathon skill)

A double is junk mileage when:

You are under 55 mpw. At that volume, add the miles to your existing runs. A 4-mile shakeout at 55 mpw is a chore that costs you a shower and buys almost nothing.
It is added purely to hit a round weekly number
It pushes total running days past what your sleep and eating can support
It creeps up in pace. A second run that drifts toward steady effort is a third workout you did not plan, and it is the single most common way advanced runners quietly overtrain.

In this plan doubles appear on Wednesdays throughout, and additionally on the Sunday of the heaviest weeks. Both halves are counted in the weekly total.

Threshold in two forms, and how to choose

Continuous tempo: one unbroken block at T pace, 20 to 50 minutes. The stimulus is metabolic and psychological at once: you are asking the body to clear lactate at a steady state, and asking your head to sit still inside sustained discomfort with no rest to look forward to. Use it when the goal is race rehearsal, when you are fresh, or when the block is 40 minutes or less.

Cruise intervals: the same T pace, broken into repeats of roughly 5 to 12 minutes with short jog recoveries (1-2 minutes, never long enough to fully recover). Because the recoveries clip the accumulation of fatigue, you can accumulate substantially more total time at T pace in a single session than you could continuously. A runner who can hold a 5-mile tempo can typically handle 6 x 1 mile or 4 x 2 miles at the same pace, which is 20-60% more threshold volume.

Choose cruise intervals when:

You want more total time at threshold than you can hold continuously (this is most of the time at this level)
You are slightly fatigued or coming off a heavy week
The weather is hot, or the course is rolling, and holding a true continuous T pace would force you to either slow below threshold or drift above it

Choose continuous tempo when:

You are rehearsing the mental demand of the race, which is continuous by definition
The block is short enough that fatigue accumulation is not the limiter
You want an honest, uninterrupted read on your current threshold fitness

This plan alternates them deliberately. Do not turn every threshold session into cruise intervals just because they feel easier. The half marathon offers no jog recoveries.

Marathon pace in a half marathon plan

M pace is a distinct stimulus, not a slow tempo. It sits below threshold, which means it can be run in large volumes without the recovery cost of a true T session, and it develops exactly the thing that lets a fast half marathoner hold their race pace to Mile 13: glycogen economy, fatigue resistance at speed, and comfort with sustained rhythmic effort. For a half marathoner, M pace also does something specific: it makes your goal half marathon pace feel like a step up from an already familiar effort, rather than a leap from easy running into the unknown.

Practically, this shows up as M-pace segments inside the long run. See the long run section below.

VO2max work, and the trade-off you must be explicit about

VO2max intervals (I pace) raise your ceiling. They also cost more recovery per mile than anything else in the plan, and every day spent recovering from an interval session is a day you are not doing threshold or long-run work, which are what actually determine your half marathon time.

The honest trade-off: for the half marathon, VO2max work is maintenance, not development. It stops your top end from rusting shut and keeps your running economy sharp. It does not win you the race. If you find yourself hitting interval sessions hard and then dragging through Thursday's medium-long run and Saturday's long run, you have inverted the plan's priorities and you will race slower for it.

This plan contains exactly one dedicated I-pace session (Week 10), plus strides and hill sprints throughout and R-pace touches in the taper. That is the correct dose. Resist adding more. If your track group runs Tuesday intervals every week, this is the plan that says no.

The long run as the centerpiece

At this level the long run is not "get the miles in." It is the highest-value session of the week and it should be constructed, not just survived.

Progression: 14 miles in Week 1 to 20 in Week 11. That is the ceiling for a half marathon build. Longer than 20 buys you very little for 13.1 and costs you a great deal in recovery.

How slow is too slow: if your long run is drifting more than about 90-120 seconds per mile slower than your M pace, it has stopped being specific to anything. You are practicing a gait and a metabolic state you will never race in. Easy is a range, and at 70+ mpw the bottom of that range is a legitimate place to spend recovery miles, but the long run should generally sit in the upper half of Easy, and it should finish faster than it started.

The case against the always-slow long run: the "all long runs are slow" doctrine is sound advice for a runner building a first aerobic base and poor advice for a runner with five years of aerobic base already banked. Once the base exists, the marginal value of another slow 18-miler is small. The marginal value of an 18-miler with 6 miles at M pace at the end is enormous, because it teaches the body to hold race-relevant effort on depleted glycogen, which is the exact physiological situation you will be in at Mile 10 of your half. From Week 6 onward, most long runs in this plan carry quality. That is the point.

Fueling rehearsal: every long run over 90 minutes is a fueling rehearsal. Take carbohydrate on the same schedule you will use on race day, using the same products the race will hand you or that you will carry. This is not optional and it is not something to figure out on race morning. See Fueling and Nutrition.

The 16-Week Plan

Doubles are written as AM / PM and both runs are counted in the weekly total.

Phase 1: Base and Strength (Weeks 1-4)

Week 1: Establish the Block (55 miles)

Monday: Easy 7
Tuesday: Easy 9 + 6x100m strides
Wednesday: Double - AM Easy 5 / PM Easy 3 = 8
Thursday: Easy 7
Friday: Easy 4
Saturday: Long run 14 at Easy, last 2 miles progressing to steady
Sunday: Recovery 6

Week 2: Build Volume (60 miles)

Monday: Easy 7
Tuesday: Easy 10 + 8x100m strides
Wednesday: Double - AM Easy 6 / PM Easy 4 = 10
Thursday: Easy 8
Friday: Easy 4
Saturday: Long run 15 at Easy, last 2 progressing
Sunday: Recovery 6

Week 3: Add Hill Strength (64 miles)

Monday: Easy 8
Tuesday: Easy 11 + 8x20sec hill sprints (walk down, full recovery, these are neuromuscular not aerobic)
Wednesday: Double - AM Easy 6 / PM Easy 4 = 10
Thursday: Easy 8
Friday: Easy 5
Saturday: Long run 16 at Easy, last 3 progressing
Sunday: Recovery 6

Week 4: Down Week (50 miles)

Monday: Rest
Tuesday: Easy 9 + 6x100m strides
Wednesday: Easy 8
Thursday: Easy 9
Friday: Easy 5
Saturday: Long run 13 at Easy
Sunday: Recovery 6

Phase 2: Threshold Introduction (Weeks 5-8)

Week 5: First Continuous Tempo (66 miles)

Monday: Easy 8
Tuesday: Threshold (continuous) - 3 warmup + 5 miles at T + 2 cooldown = 10
Wednesday: Double - AM Easy 6 / PM Easy 4 = 10
Thursday: Easy 10
Friday: Easy 5
Saturday: Long run 17 at Easy, last 3 progressing
Sunday: Recovery 6

Week 6: First Cruise Intervals (70 miles)

Monday: Easy 8
Tuesday: Threshold (cruise intervals) - 3 warmup + 6x1 mile at T with 1 min jog recovery + 2 cooldown = 12
Wednesday: Double - AM Easy 7 / PM Easy 4 = 11
Thursday: Easy 9
Friday: Easy 5
Saturday: Long run 18 - 14 at Easy + 4 at M pace to finish
Sunday: Recovery 7

Week 7: Extend the Tempo (74 miles)

Monday: Easy 9
Tuesday: Threshold (continuous) - 3 warmup + 7 miles at T + 2 cooldown = 12
Wednesday: Double - AM Easy 7 / PM Easy 5 = 12
Thursday: Medium-long 12 at Easy
Friday: Easy 5
Saturday: Long run 18 - 12 at Easy + 6 at M pace to finish
Sunday: Recovery 6

Week 8: Down Week (56 miles)

Monday: Rest
Tuesday: Easy 10 + 6x100m strides
Wednesday: Easy 8
Thursday: Easy 10
Friday: Easy 5
Saturday: Long run 15 at Easy
Sunday: Recovery 8

Phase 3: Threshold Density and Peak Volume (Weeks 9-11)

Week 9: More Time at Threshold (76 miles)

Monday: Easy 9
Tuesday: Threshold (cruise intervals) - 3 warmup + 5x1.5 miles at T with 2 min jog recovery + 2 cooldown = 13
Wednesday: Double - AM Easy 8 / PM Easy 5 = 13
Thursday: Medium-long 12 at Easy
Friday: Easy 5
Saturday: Long run 18 - 10 at Easy + 8 at M pace to finish
Sunday: Recovery 6

Week 10: The One VO2max Session (78 miles)

Monday: Easy 10
Tuesday: Interval (VO2max) - 3 warmup + 6x1000m at I pace with 400m jog recovery + 2 cooldown = 11
- This is the only dedicated I-pace session in the plan. Run it well, then let it go. Do not add a second one.
Wednesday: Double - AM Easy 8 / PM Easy 5 = 13
Thursday: Medium-long 13 at Easy
Friday: Easy 6
Saturday: Long run 19 - 13 at Easy + 6 at M pace to finish
Sunday: Recovery 6

Week 11: Peak Volume (80 miles - PEAK)

Monday: Easy 10
Tuesday: Threshold (broken tempo) - 3 warmup + 2x4 miles at T with 3 min jog recovery + 2 cooldown = 14
Wednesday: Double - AM Easy 8 / PM Easy 5 = 13
Thursday: Medium-long 13 at Easy
Friday: Easy 6
Saturday: Peak long run 20 - 10 at Easy + 8 at Half Marathon pace + 2 Easy cooldown
- Full fueling rehearsal: race-morning breakfast, race-day carbohydrate schedule, race-day shoes.
Sunday: Recovery 4

Phase 4: Tune-Up and Race Specificity (Weeks 12-13)

Week 12: Down Week + 10K Tune-Up (62 miles)

Monday: Recovery 4
Tuesday: Medium-long 12 at Easy
Wednesday: Double - AM Easy 6 / PM Easy 4 = 10
Thursday: Easy 10 + 4x200m at R pace (full recovery)
Friday: Easy 6
Saturday: Easy 6 + 4x100m strides
Sunday: 10K TUNE-UP RACE - 3 warmup + 10K race (6.2) + 4.8 cooldown = 14
- OR, if not racing: 14 mile long run with 4 miles at Threshold in the middle
- Convert your 10K time back through VDOT and Pace Tables. If your predicted half marathon pace has moved, your Week 13 sessions and your race target move with it. This is the entire point of the tune-up.

Week 13: Race-Specific (74 miles)

Monday: Recovery 6
Tuesday: Half Marathon Pace - 3 warmup + 3x2 miles at HM pace with 3 min jog + 2 cooldown = 12
Wednesday: Double - AM Easy 8 / PM Easy 5 = 13
Thursday: Medium-long 12 at Easy
Friday: Easy 6
Saturday: Long run 18 - 12 at Easy + 6 at Half Marathon pace to finish
- Second and final full fueling rehearsal.
Sunday: Recovery 7

Phase 5: Three-Week Taper (Weeks 14-16)

The taper rule: volume comes down sharply, intensity does not. You cut how much you run, not how fast. Removing intensity in the taper is how runners arrive at the start line feeling flat, heavy, and slow, then blame the taper for "making them lose fitness." You do not lose fitness in three weeks. You lose sharpness in three weeks, and only if you go soft.

Volume drops roughly 20-25% per week: 74 to 58 to 44 to race week.

Week 14: Taper Begins (58 miles, down 22%)

Monday: Easy 8
Tuesday: Threshold (continuous) - 2 warmup + 5 miles at T + 2 cooldown = 9
Wednesday: Easy 9
Thursday: Easy 8
Friday: Easy 5
Saturday: Long run 14 - 11 at Easy + 3 at M pace to finish
Sunday: Recovery 5

Week 15: Sharpen (44 miles, down 24%)

Monday: Easy 6
Tuesday: Threshold (cruise intervals) - 2 warmup + 4x1 mile at T with 1 min jog + 2 cooldown = 9
Wednesday: Easy 6
Thursday: Easy 5
Friday: Easy 4 + 6x100m strides
Saturday: Long run 10 at Easy, last 2 at M pace
Sunday: Recovery 4

Week 16: Race Week (23 miles + race)

Monday: Easy 6
Tuesday: Easy 5 + 6x100m strides
Wednesday: Sharpener - 1 warmup + 2 miles at T + 4x400m at I pace with 90 sec jog + 1 cooldown = 5
Thursday: Easy 4
Friday: Rest
Saturday: Easy 3 + 4x100m strides
Sunday: RACE DAY - HALF MARATHON

Weekly total excluding the race: 23 miles.

Weekly Mileage Progression

Week 1:  55
Week 2:  60
Week 3:  64
Week 4:  50  (down week)
Week 5:  66
Week 6:  70
Week 7:  74
Week 8:  56  (down week)
Week 9:  76
Week 10: 78
Week 11: 80  (PEAK)
Week 12: 62  (down week + 10K tune-up)
Week 13: 74
Week 14: 58  (taper)
Week 15: 44  (taper)
Week 16: 23  (+ race)

Long Run Progression

Week 1:  14  (Easy, progressive finish)
Week 2:  15  (Easy, progressive finish)
Week 3:  16  (Easy, progressive finish)
Week 4:  13  (down week, Easy)
Week 5:  17  (Easy, progressive finish)
Week 6:  18  (4 at M pace)
Week 7:  18  (6 at M pace)
Week 8:  15  (down week, Easy)
Week 9:  18  (8 at M pace)
Week 10: 19  (6 at M pace)
Week 11: 20  (8 at HM pace)  <- PEAK
Week 12: 10K race (or 14 with T work)
Week 13: 18  (6 at HM pace)
Week 14: 14  (3 at M pace)
Week 15: 10  (2 at M pace)
Week 16: RACE (13.1)

Training Intensity Distribution

Roughly:

~78% Easy and Recovery
~8% Marathon pace
~9% Threshold
~2% Half Marathon pace
~1% Interval, Repetition, strides, hill sprints

The percentage of hard running does not go up as you get more advanced. The absolute volume of hard running goes up, because the total goes up. This is the distinction most people miss when they move from an intermediate plan to an advanced one: 10% of 80 miles is a great deal more threshold work than 10% of 45 miles, and it is delivered without changing the ratio that keeps you healthy.

The Risk at This Volume

Be frank with yourself. At 70-80 mpw with two quality sessions and a quality long run, you are running close to the edge of what your body can absorb, and the margin between "adapting" and "digging a hole" is narrower than it was at 40 mpw. The plan is designed to keep you on the right side of that line. You can put yourself on the wrong side of it in about eight days.

Overtraining warning signs

Any two of these together, for more than a few days, means back off now:

Resting heart rate elevated 5+ bpm over your normal for several consecutive mornings
Easy pace at your normal easy heart rate has slowed noticeably, or normal easy pace now requires a higher heart rate
You cannot hit T pace on a day you should be able to, and it feels effortful rather than merely hard
Sleep is disrupted despite heavy training (this is diagnostic, not paradoxical)
Persistent low mood, irritability, or loss of motivation to run
Appetite suppression after hard sessions
A niggle that has been there for more than a week and is not improving
Frequent minor illness, sore throats, lingering colds

Read Recovery and Adaptation and Injury Prevention before Week 1, not after Week 9.

The cost of skipping a down week

Weeks 4, 8, and 12 are down weeks. They are not optional and they are not a reward you earn by feeling tired. They are load-bearing structure.

Adaptation happens during the reduction, not during the load. Three hard weeks build the stimulus; the fourth week is when your body actually banks it. Skip the down week and you do not get a bonus week of fitness. You get a week of accumulated fatigue that you carry into the next block, which means the next block's quality sessions are run at a lower quality, which means the stimulus is weaker, which means you have traded a real adaptation for a number on a spreadsheet.

The pattern is depressingly consistent: a runner feels strong in Week 7, skips the Week 8 down week because the fitness is coming, has a mediocre Week 9, a bad Week 10, and either a stress fracture or a season-ending illness in Week 11. If you feel too good to take the down week, that is the strongest possible evidence that the plan is working and you should take it exactly as written.

If in doubt, take the down week. You have never once regretted taking a down week.

Race Week

Sunday, 7 days out: last long run of the block is already behind you (Week 15 Saturday). Week 16 begins.
Wednesday, 4 days out: last sharpener. Short, fast, and finished feeling like you could do more.
Thursday-Friday: easy running and rest. Legs will feel strange. This is normal and it is not a sign of anything.
Saturday: short shakeout with strides. Lay out kit. Nothing new.
Race morning: breakfast 2.5-3 hours out, exactly what you have practiced. Nothing new.

Race Day Warm-Up

12-15 min easy jog, finishing 20-25 min before the gun
Dynamic mobility
4-6x100m strides, the last two at goal race pace
Final bathroom stop
On the line 8-10 min early

Race Strategy

At sub-1:25 the half marathon punishes an aggressive first 5K more than almost any other distance, because you spend the entire race at threshold and there is no aerobic buffer to absorb the debt you take on early.

Even splits, or a very slight negative split. This is not a compromise position, it is the physiologically optimal one. Every credible analysis of half marathon performance points the same direction: the fastest time you are capable of on the day is produced by the flattest pace distribution you can manage, adjusted for terrain and wind. Going out 10 seconds per mile fast to "bank time" does not bank anything. It borrows, at a punitive rate, and the loan comes due at Mile 10.

The execution:

Miles 1-2: goal pace, or 2-3 sec/mile slower. Not faster. The crowd around you is running a different race and most of them are about to be very unhappy.
Miles 3-8: settle. Goal pace should feel controlled and rhythmic, roughly "comfortably hard." If it feels genuinely hard here, your goal is wrong and it is better to know it at Mile 4 than Mile 11.
Miles 9-11: this is the race. The effort rises while the pace stays flat. Hold form, shorten your focus, run the mile you are in.
Miles 12-13.1: whatever is left.

Fueling: at 1:25 or under, most runners need one gel around Mile 6-7 plus fluid at stations. Above 1:30, consider two. Whatever you choose, you have already rehearsed it in Weeks 11 and 13. See Fueling and Nutrition.

Post-Race Recovery

10-15 min walk, food and fluid within the hour
No running for 2-3 days, easy running only for 7-10 days
No quality work for 2 weeks
Rule of thumb at this volume: one easy day per mile raced, so around 13 days before you are back to hard training

Customization Guidelines

If your base is 45-50 mpw rather than 55+

Run the first two weeks at 48-52 and let the progression catch up by Week 5
Cap the peak at 70 rather than 80: trim the Wednesday double and 2-3 miles from the Thursday medium-long run
Do not trim the long run or the quality sessions to make room. Trim easy volume.

If you hold 65+ mpw year-round

You can start at Week 3
You can carry the peak to 85 by adding a second double (Friday AM/PM) and 2 miles to the Thursday medium-long
Do not extend the long run past 20 miles for a half marathon. There is nothing there for you.

If you miss a session

Easy or recovery run: skip it, do not make it up
Long run: reschedule inside the same week, even at the cost of an easy day
Threshold session: the most important quality session in the plan. Reschedule it, even if that means running it on a Thursday.
The one VO2max session: skip it if you must. It is the least load-bearing hard session here.
Never: stack two quality sessions inside 48 hours to "catch up." That is how the plan turns into an injury.

If you are too tired

Convert the quality session to an easy run and reassess in 48 hours
Take the extra rest day. One missed workout costs you nothing; three weeks of overreaching costs you the race.
Check that your easy days are genuinely easy. At 75 mpw this is the most common failure mode and it is almost always the cause.

Key Takeaways

The half marathon is a threshold race. Threshold work is the point of this plan. Everything else supports it.
Use both forms of threshold. Cruise intervals to accumulate volume at T pace, continuous tempo to rehearse the mental demand of an unbroken hard effort.
M pace is its own stimulus. It builds fatigue resistance at speed without the recovery cost of threshold, which is why it lives inside your long runs.
One VO2max session is enough. More interval work does not make you a faster half marathoner. It makes you a more tired one.
The long run carries quality. Once you have years of base, another slow 18 buys very little. An 18 with 6 at M pace buys a great deal.
Doubles are aerobic filler, not extra workouts. If your second run has a pace target, it has stopped being a second run.
Down weeks are where adaptation happens. Skipping one does not add fitness. It subtracts it, on a delay.
Taper cuts volume, never intensity. Feeling flat in the taper is normal. Feeling flat because you stopped running fast is self-inflicted.
Race even. Banked time is borrowed time, and the interest rate is brutal.

Next: 18-Week Marathon Training Plan (Advanced Level) for the marathon build, or VDOT and Pace Tables to turn every zone name in this plan into a number you can actually run.