3 months

Run a 5k in 3 months

3 sessions a week, 25–40 minutes each

Three months to a 5k is the version that actually holds. The extra four weeks over the standard eight-week plan aren't padding — they're recovery, repeated weeks, and a slower ramp for your tendons, which adapt far more slowly than your lungs.

This is the right timeframe if you're starting from no running at all, carrying extra weight, coming back from injury, or you've tried a faster plan before and your shins ended it.

The protocol

  1. Weeks 1–2

    Walking with jogs in it

    • Three sessions a week: 5 min walk, 8 rounds of 1 min jog / 2 min walk, 5 min walk.
    • Repeat the same week twice. Identical sessions are how you learn what 'easy' feels like.
    • Add a 20–30 minute walk on one off day.
  2. Weeks 3–4

    Longer jogs, shorter walks

    • Week 3: 6 rounds of 90 sec jog / 2 min walk.
    • Week 4: 5 rounds of 2 min jog / 2 min walk.
    • Keep the pace slow enough to nose-breathe for most of each jog.
  3. Weeks 5–6

    The three-minute block

    • Week 5: 4 rounds of 3 min jog / 2 min walk.
    • Week 6: 3 rounds of 5 min jog / 2 min walk.
    • First real fatigue shows up here. One session can always be swapped for a brisk 30-minute walk.
  4. Week 7

    Deliberate down week

    • Cut every session back to 20 minutes total, at the week 5 intervals.
    • This isn't a rest week, it's an absorption week. Adaptation happens in the easy weeks.
    • Use the spare energy to sort out shoes if yours are older than a year.
  5. Weeks 8–9

    Continuous running

    • Week 8: 10 min jog / 3 min walk / 10 min jog.
    • Week 9: 20 minutes continuous, three times, as slowly as it takes.
    • Slow enough is roughly the pace where you'd be mildly embarrassed if a friend saw you.
  6. Weeks 10–11

    Build to 30 minutes

    • Week 10: two 22-minute runs, one 25-minute run.
    • Week 11: two 25-minute runs, one 30-minute run.
    • Most people cover 5k inside 30–38 minutes at this stage without trying to.
  7. Week 12

    Run the 5k

    • One easy 20-minute run on Monday, one 10-minute shakeout midweek, then rest.
    • Run the 5k on a flat route, slower than you think for the first kilometre.
    • Book the next goal in the same week — a second 5k, a parkrun, or a 10k build.

How you'll know it's working

  • Sessions stop being an event you dread and start being a thing you do.
  • You wake up the day after a run and forget you ran.
  • Your jog pace and your fast-walk pace stop feeling like the same effort.

When you miss a day

Twelve weeks has slack built into it. A missed week just shifts everything right by a week — Mosey rebuilds the calendar rather than asking you to double up. Two easy sessions beat one heroic one every time.

How Mosey helps

You don't have to hold the plan in your head.

Reading a protocol is the easy part. Mosey turns this one into scheduled days, adjusts it when your week falls apart, and keeps the streak alive while it does.

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Life happened on Wednesday. I trimmed Thursday down — the plan still lands on time.

Questions

Why is this slower than couch-to-5k?

Because tendon and bone adapt slower than fitness. The extra weeks are where injuries don't happen. If eight weeks worked for you before, use the eight-week version.

Can I run on a treadmill?

Yes, all of it. Set a 1% incline so it roughly matches outdoor effort, and be aware that the first outdoor run will feel harder.

What if I can already run 10 minutes?

Start at week 5 and keep the down week. Skipping the down week is the most common way people turn a good start into shin splints.

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