Tempo and Threshold Workouts for a Half Marathon

A threshold workout is sustained running near the boundary where effort becomes difficult to stabilize for long. In practical terms, you are running hard enough that conversation shrinks to a few words, but controlled enough to repeat the planned duration without a late collapse. The first block should feel restrained. The final block should be demanding because work accumulated—not because you guessed too fast.

“Tempo” is a broader coaching word. Some plans use it for 20–40 minutes near threshold; others use it for any sustained run faster than easy. Read the actual structure rather than trusting the label. A 30-minute steady progression and 4 × 6 minutes at threshold with 90-second jogs solve related but different problems. This guide uses threshold for the controlled boundary region and tempo for a continuous or extended sustained format.

Threshold is also not a single laboratory truth. Researchers use lactate threshold, ventilatory threshold, maximal lactate steady state, and other methods that do not produce identical values. For a recreational runner without testing, pace from a current performance plus RPE, breathing, and repeatability gives a responsible starting point. The workout examples here illustrate decisions; they are not individualized prescriptions or guarantees of a physiological outcome.

Use a recent, well-paced performance rather than a goal. A VDOT calculation can translate that result into a threshold range. Short races are useful when the runner has enough endurance to make the equivalence plausible. A fast 5K from a speed-oriented runner may produce a threshold pace that is difficult to support with current volume; begin at the slower edge and use broken repetitions to confirm it.

A field alternative is a controlled 30-minute time trial, but a maximal test carries its own recovery cost and is inappropriate for some runners. If used, the test must be paced evenly, not as a ten-minute sprint followed by survival. You do not need to test when a recent race already exists. The safest practical approach is triangulation: calculator range, RPE 7–8 late, few-word speech, and stable repetitions.

Threshold pace is a range because conditions matter. On a rolling route, hold the effort up the hill and let pace slow. In warm weather, accept a slower pace from the start. On a treadmill, use perceived effort and avoid assuming the displayed speed exactly matches outdoor running. The correct threshold pace is the one you can organize into repeatable work today.

For runners new to structured quality, 12–20 total minutes at controlled threshold can be enough. Established runners may accumulate roughly 20–35 minutes, often through repetitions. These are practical examples, not universal dose rules. A 20-mile-per-week runner and a 55-mile-per-week runner do not absorb the same session simply because their threshold pace is calibrated.

Count all demanding work. A week with a race-pace long run, hilly group run, and strength session may not have room for 30 minutes of threshold. Add volume only when repetitions remain even and the following easy days are normal. Progress one lever: another repetition, a slightly longer repetition, or reduced recovery—not all three.

Threshold typically fits after an easy day and at least two or three days before a demanding long run. Runners with three running days may use one threshold session, one easy run, and one easy long run. More frequent runners can surround it with easy volume. The distribution review in the source list describes successful endurance programs as containing substantial low-intensity work; it does not establish one perfect ratio for every recreational half-marathon runner.

A simple four-exposure sequence might begin with 5 × 4 minutes, then 4 × 6 minutes, then 3 × 8 minutes, then 2 × 12 minutes. Total work stays near 20–24 minutes while uninterrupted duration grows. This is not the only sequence, but it demonstrates one-variable progression. The pace and recovery do not also need to become more aggressive.

Repeat an exposure when execution is uneven. Progression is earned when the first and last blocks resemble one another, RPE rises gradually, and the next easy days remain useful. If the set fades, return to the prior duration or slow the range. A repeated session is not a wasted week; it creates the comparison needed to make a good decision.

In the half-marathon-specific phase, some threshold work can shift toward realistic race pace with longer, slightly easier blocks. For example, 3 × 12 minutes at half-marathon effort is not a harder version of 4 × 6 minutes at threshold; it asks a different question about race rhythm. Keep the labels and purposes separate so race-pace work does not creep upward into another threshold test.

During the taper, preserve a small familiar dose and reduce total work. Two or three short blocks can remind you of rhythm without creating a new adaptation target. If fresh legs make the pace feel easy, finish the written session. The taper succeeds by reducing fatigue, not by discovering how hard you can train close to race day.

Calculate a starting range from a recent result with the free VDOT calculator, then choose the entry-level or classic broken session. Write three guardrails before you begin: pace range, RPE ceiling, and stop rule. Afterward, compare the first and final work segments and note the next day's response. Repeat the same structure before progressing it.

If the range and effort disagree, preserve effort and revise the estimate. A personalized plan can place threshold work around your long run, available days, and race date. Its usefulness is not that it makes threshold harder; it is that it keeps the workout proportional to the rest of your training.

For the first review, ignore the fastest split. Compare work-time total, pace variation, RPE at the end of each block, and whether the written recovery remained enough. If every block was smooth and the final RPE stayed below the intended range, keep the same session once more or add a small amount of work. Do not automatically speed up; threshold development is also the ability to hold control for longer. Add faster repetitions only after understanding how interval workouts differ from threshold work.