Your Plan: Improving Your Half Marathon Time

Your Plan: Improving Your Half Marathon Time

Once you've finished a half marathon, the training question changes from "can I cover 13.1 miles" to "how much faster can I cover 13.1 miles" -- and that shift means adding real pace-specific work on top of the aerobic base you've already built, rather than just repeating the same easy-mileage buildup that got you your first finish.

A typical intermediate half plan runs 10-14 weeks and adds two structured sessions a week beyond easy running: a tempo run (a sustained, comfortably-hard effort at or near goal race pace, building toward 5-7 miles by the peak of the plan) and either intervals or a race-pace-specific long run segment (running the middle miles of a long run at goal pace, with easy miles before and after). This combination trains both your lactate threshold and your ability to hold goal pace when your legs are already tired -- both directly relevant to a strong last 5K of the actual race.

The long run itself gets more sophisticated too: rather than just accumulating easy miles, it's common to build to 10-12 miles with a meaningful chunk -- often the last 3-4 miles -- run at or near goal half pace. That teaches your legs what goal pace feels like under real fatigue, which is a completely different skill than running the same pace fresh.

Pacing strategy matters more here than it did for a first half. A slightly negative split (running the second half a touch faster than the first) tends to produce better results than an even-paced or positive-split race, since most runners overestimate their sustainable pace when they're fresh at the start. Knowing your actual goal pace ahead of time -- ideally with a slightly conservative first 5K built in -- takes the guesswork out of race-morning pacing decisions.

Recovery discipline matters just as much at this level, arguably more: two hard sessions a week on top of a long run only works if the easy days around them stay genuinely easy. Runners who improve fastest at this stage are usually the ones who resist the urge to turn every run into a moderate effort, not the ones who add a third hard day.

Source: general intermediate half-marathon training principles (tempo/threshold work, race-pace long-run segments, negative-split pacing) consistent with widely used coaching frameworks such as Hansons and Pfitzinger-style intermediate plans. This is training guidance, not medical advice.

How Intermediate Half Marathon compares

* Illustrative figures -- use the calculators below for your exact numbers.