Structured Long Run Workouts for Half Marathon

Structured long run workouts come in three formats — fast-finish, progression, and mid-run tempo — and each one belongs at a different point in your training block, not interchangeably on a menu. Below: what defines each format, how to sequence them across a training block, which one fits your experience level, sample workouts with paces, and the recovery and fuelling adjustments that need to change around a hard long run.

Use the wrong format for where you are in training and you either waste the session or dig a hole you can't recover from before race day — reaching for fast-finish work too early teaches exactly the wrong habit, and a beginner grinding through mid-run tempo before they're ready just accumulates fatigue with nothing to show for it. Get the sequencing right and each long run builds directly on the one before it.

Fast-Finish, Progression, and Mid-Run Tempo, Defined

Three formats cover almost everything you need. Fast-finish: 70-80% easy, final 20-30% at half marathon goal pace or slightly faster — for example, 7 easy miles plus 3 miles at goal pace inside a 10-mile long run.

Progression: a continuous, gradual speed-up across the whole run in three even thirds — easy, then steady, then comfortably hard. Mid-run tempo: a 25-50% easy warm-up, then a sustained block at 10K-to-half-marathon effort in the middle, then easy to finish.

Sequencing These Workouts Across Your Training Block

This sequencing is the single biggest gap in other advice on this topic, so here it is laid out properly.

Choosing the Right Format for Your Experience Level

First-time half marathoners should use progression long runs almost exclusively. I keep first-timers on progression long runs almost exclusively — fast-finish and mid-run tempo are higher-value for someone chasing a specific time, but they add risk a first-timer doesn't need to take on.

PR-chasing improvers should prioritise mid-run tempo and fast-finish instead, since these more directly prepare you for holding goal pace under accumulated fatigue — which is exactly what race day demands.

Sample Workouts With Paces and Effort Levels

Three named sessions give you a concrete starting point for each format. Fast-Finish 10: 7 miles easy, at 60-90 seconds per mile slower than goal pace, plus 3 miles at goal pace.

Progression 12: 4 miles easy, plus 4 miles at steady or moderate effort, plus 4 miles at comfortably hard — roughly 10-15 seconds per mile faster than goal pace. Mid-Run Tempo 11: 3 miles easy, plus 5 miles at 10K-to-half effort, plus 3 miles easy.

Adjusting the Surrounding Week Around a Hard Long Run

The day before a structured long run should be a full rest day or a very short shakeout, not a normal easy run. The day after should be an easy run or full rest, with your next quality session pushed to at least 48 hours after the structured long run, not sitting in its usual midweek slot.

Fuelling and Hydration for Workout Long Runs

Take a carb source — a gel or chews — roughly 15 minutes before starting the hard segment on any long run over 90 minutes, not just at generic hourly intervals. For the full fuelling and mental-rehearsal protocol that pairs with these sessions, see rehearsing race pace during long training runs.

Troubleshooting: What to Do When the Pace Isn't There

If you're more than 15 seconds per mile off the prescribed hard-segment pace in the first mile of that segment, don't chase it. Hold the pace you can actually sustain and treat the session as complete.

Chasing a missed number inside a structured long run is how these sessions turn into overreaching rather than useful training. I've coached an athlete who chased a missed goal-pace segment mid-long-run and turned a planned structured session into an unplanned max effort, costing a week of recovery. Compare that to the athlete who let the pace go and banked the session as completed and useful — same missed number, very different outcomes.

Frequently Asked Questions

What's the difference between a fast-finish and a progression long run?

A fast-finish long run is 70-80% easy with the final 20-30% run at half marathon goal pace or slightly faster. A progression long run gradually speeds up across the whole run in three even thirds — easy, then steady, then comfortably hard — rather than holding easy pace until a sudden late push.

How much of the long run should be easy before any intensity?

It depends on the format. Fast-finish sessions keep 70-80% easy. Mid-run tempo sessions use a shorter 25-50% easy warm-up before the sustained hard block. Progression runs don't have a fixed easy percentage since the whole run gradually speeds up.

How often should I include a structured long run?

Roughly every 2-3 weeks once you're out of the base phase, alternating with plain easy long runs. Doing a structured long run every single week doesn't allow the recovery these sessions demand.

What pace should the hard portion be run at?

It depends on the format: fast-finish segments run at half marathon goal pace or slightly faster; progression's final third runs roughly 10-15 seconds per mile faster than goal pace; mid-run tempo blocks run at 10K-to-half-marathon effort, which is faster than goal pace but still controlled.

Which format should a beginner choose?

Progression long runs, almost exclusively. They're the gentlest structure, carry the lowest injury risk, and teach even effort — exactly what a first-time half marathoner needs before taking on the higher-value, higher-risk fast-finish or mid-run tempo formats.

Does recovery differ after a structured long run compared to an easy one?

Yes. The day before should be a full rest day or a very short shakeout, not a normal easy run. The day after should be easy or full rest, and your next quality session should wait at least 48 hours after the structured long run rather than sitting in its usual midweek slot.

What if I miss the target pace mid-session?

If you're more than 15 seconds per mile off the prescribed hard-segment pace in the first mile of that segment, don't chase it. Hold the pace you can actually sustain and treat the session as complete — chasing a missed number is how a useful structured long run turns into overreaching.

How often should structured long runs replace easy ones each month?

About one to two structured long runs per month once you're past the base phase, with the remaining long runs staying fully easy. That balance gives you the training stimulus without accumulating fatigue faster than you can recover from it.

Should I fuel differently for a workout long run than an easy one?

Yes — take a carb source like a gel or chews roughly 15 minutes before starting the hard segment on any long run over 90 minutes, rather than just at generic hourly intervals. The hard segment demands fuel that's already available, not fuel still being digested.

Which format best predicts race readiness?

Mid-run tempo and fast-finish sessions predict race readiness most directly, since both test holding a hard, race-relevant effort on legs that already have miles in them. Progression runs build the foundation those sessions need, but they test a different skill — gradual effort control, not sustained race pace under fatigue.

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