Free, research-backed plan builder

From the couch
to the finish line.

Free 5K, 10K, half marathon & marathon training-plan builder

Tell us where you're starting, the race you've got your eye on, and when it is. We'll build you a week-by-week plan that ramps up gently, keeps most of your running easy, builds in recovery, and tapers you into race day fresh — all backed by published sports science, none of it guesswork.

Built around you — your experience, your schedule, your race date.
Evidence-based progression — mileage builds capped the way the injury research suggests, with cutback weeks and a real taper.
Every day mapped — easy runs, workouts, long runs, and rest, each linked to the study behind it.
  • 23cited sources behind it
  • 100%free — no account needed
  • Privateruns entirely in your browser

Build your plan

About 30 seconds. No account needed.

— weeks

Runs in your browser — your plan is saved on this device. Sign in (optional) to sync across devices.

Your plan

Every session links to the research behind it — see Methodology.

10K
0
total training miles
Crawl→Sprint · Wave 1
Peak week
Longest run
Cutback weeks
Taper

Your weekly mileage, week by week

Volume climbs no more than ~10% a week, eases back every fourth week, peaks, then tapers so you arrive fresh.

Build Cutback Peak Taper Race week

Your training calendar

How to use it: click or tap any training day to mark it done — it turns green and your weekly progress updates. Click again to undo. Hover a day for the full session details, and use the i buttons for the research behind each workout. Your progress is saved on this device automatically.

Easy runs

Comfortable enough to hold a conversation. Most of your miles live here — that's by design, not laziness.

Workouts

Intervals and tempo segments at "comfortably hard." You should finish feeling worked, not destroyed.

Long runs

Slow and steady. The point is time on your feet, so run them a notch easier than your easy pace.

Rest days

Where the fitness actually gets built. Walk, stretch, or do nothing — skipping rest is how injuries start.

This plan is a general training template, not medical or coaching advice. If you're new to exercise, managing a health condition, or feel pain (not just soreness) while training, check in with a doctor or a coach. Listen to your body — it outranks any spreadsheet.

How your plan is built

Mile 1

Start where you are

Your starting mileage comes from your current running habit — not from where a generic plan thinks you should be. New runners begin with run/walk-friendly volume.

Mile 2

Climb, then breathe

Weekly volume increases a little at a time, and every fourth week pulls back so your legs can absorb the work. That rhythm is what keeps you healthy through the build.

Mile 3

Arrive fresh

The final weeks taper your mileage down while keeping a little sharpness, so you hit the start line rested, springy, and ready to enjoy the day.

Training plans by distance

Whatever you're training for, the same proven principles do the heavy lifting. Pick your race to see what training for it actually looks like — or skip ahead and build your plan now.

More from the ObsidianAsh studio

Crawl2Sprint is one of a handful of small, do-one-thing-well products we make. If this one's been useful, you might like the others too.

Build my plan