Analysis · Plan basics

Goals our planner declines, and why

When the planner says no to a goal, it explains why and offers options. Four real examples, generated from the engine.

By the Milewell teamPublished October 30, 2026Checked October 30, 20262 min read

Our planner sometimes says no to a goal. This page explains when and why, with real examples.

Why decline at all?

Our planner is built on one premise: mileage should build gradually from where you are. It simulates a gradual build from your current running and checks where it ends up. If the result falls short of the minimum for your goal, it tells you instead of squeezing the plan.

When it says no

The planner declines to write a plan when any of these is true:

  • A recent injury or pain limited your running. It cannot judge that safely and suggests seeing a doctor or physical therapist first.
  • Your base is below 2 runs and 3 miles a week. It suggests building a gentle run-walk habit first.
  • The race is fewer than 4 weeks away.
  • You listed too few running days for the distance.
  • A gradual build cannot reach the minimum peak week or long run for the goal in the weeks you have. Two of the examples below are this kind.

Four real examples

The examples below are generated from the planner, with the exact reasons and alternatives it gave. Notice that each one points somewhere: a later race, a shorter distance, more days, a base-building step or a visit to a professional.

What a decline is not

It is not a verdict on you, and it does not say you could never run the distance. It says that, with these numbers and under conservative rules, a gradual build does not get there in time. Give yourself more weeks or a different goal and the answer changes.

It is also not medical clearance in the other direction. When the planner does write a plan, it is general training information, and it cannot assess your health.

Try your own numbers

The race readiness checker runs the same planner on your goal, timeline and weekly miles, and shows the reasons and alternatives if it declines.

Four goals the planner declines

These are real planner outputs for the answers shown, with the reasons and alternatives it gave.

Half marathon in 6 weeks, from 12 miles a week

  • In 6 weeks, a gradual build from 12 miles a week reaches about 14.5. A half marathon needs at least 20.
  • The long run only builds to about 6.5 miles, and a half marathon needs at least 8.

What the planner suggests instead:

  • A 10K fits your current timeline.
  • More running days, or longer runs on your long-run day, would also help.

10K in 4 weeks, from 8 miles a week

  • With 4 weeks to go there isn't time to build up to a 10K. You'd need to be running at least 5 miles for your longest run and 14 miles a week already.

What the planner suggests instead:

  • A race about 16 weeks after your plan starts (around 2027-02-28) would allow a gradual build.
  • A 5K fits your current timeline.
  • More running days, or longer runs on your long-run day, would also help.

5K in 8 weeks, from 2 miles a week

  • This plan starts from a base of at least 2 runs and 3 miles a week. You're below that.

What the planner suggests instead:

  • Build a gentle base first, with easy running or run/walk on 2–3 days a week, until you reach 2 runs and 3 miles a week. We don't write run/walk plans yet.

5K in 8 weeks, with a recent injury

  • You reported a recent injury or pain that limited running. We can't judge that safely, so we're not generating a plan.

What the planner suggests instead:

  • See a doctor or physical therapist, and come back once you're running comfortably again.

Generated at build time from the planning engine. Assumes regular runs up to 60 minutes and a long run up to 2 hours.

What this article is based on

Engine statements. Statements about what the planner does come from its published rules and outputs. See How It Works and Our method.

Written by the Milewell team and published on the site owner's approval. The owner is not a credentialed coach or clinician, and this article has not been reviewed by one. See our editorial policy.

This plan is general training information, not medical advice and not clearance to exercise. Stop and get professional advice if you feel pain, dizziness, chest discomfort or unusual shortness of breath. If you have a health condition or are unsure whether running is right for you, talk to a doctor first.