Marathon Coach · Train Smarter
A 12-Week Half Marathon Structure That Survives Real Life
How I’d structure twelve weeks for a half marathon: base, build, sharpen, taper — with busy-week rules so the plan still works when work does not.
Twelve weeks is enough if you don’t waste the middle
I like twelve weeks for a half when you can already run a few times a week without drama. If you’re still building walk-run frequency, give yourself more runway. The calendar is not a dare.
The shape I trust: three weeks settling habits and easy volume, five to six weeks growing the long run and one quality day, two weeks sharpening without heroics, then a short taper.
What each phase is for
Base weeks answer “can I show up?” — frequent easy runs, a modest long run, zero ego intervals. Build weeks answer “can I absorb more?” — long run steps up, one quality session earns its place, easy days stay conversational. Sharpen weeks keep the long run honest but stop chasing new peaks. Taper is practice race rhythm, not a vacation from all stress.
Most people invert that. They hammer early, get tired, then invent a taper out of necessity instead of design.
Busy-week triage
When life deletes two runs, I keep the long run and one quality if recovery allows. I cut optional easies before I cut anchors. I never “make up” a threshold day the night after a bad sleep just to keep a color on a calendar.
Intensity distribution research keeps reminding coaches that most volume should be easy. Busy runners turn medium into a lifestyle. Protect easy so hard can mean something.
Race week is a skill
Practice your morning fuel, warm-up, and pace discipline on smaller days before race week. The half rewards patience in the first 5K more than it rewards the playlist you queued at the expo.
If twelve weeks taught you anything, it should be that consistency beats a single perfect long run you can’t walk on Monday.