As of 13 August 2026, AI can only partly train for a half-marathon.

This still needs a person who signs their name to it.

Can you do it?

5 minutesto a draft.

30 minutesto something you’d act on.

Cost, all in£0

Skill needednone

Who has to check ityou

What the alternative costsA purpose-built app such as Fitbod is an alternative, but its listing here does not provide a price.

If this goes wrong: an unsuitable increase in training or a missed warning sign leaves you injured and unable to train.

What to actually do

Hand it to a person
The route this page recommends
A person who owns the outcome does this end to end, worth it when the failure is dear.
Use a tool built for this
Second choice

Do it yourself

The distant third

A chat interface, no skill needed, and roughly 30 minutes until you can act on the result.

How to actually do it

Open a chatbot such as ChatGPT, Claude or Gemini and paste the full prompt.
Replace each bracketed slot with your actual race date, recent running, longest run, availability, other exercise, equipment, age and relevant health or injury information.
Send the prompt and ask a follow-up question for any missing information the chatbot identifies before accepting the calendar.
Compare every session and date in the draft against your real diary, current running level and ability to recover between sessions, removing anything you cannot safely or practically do.
Check any pain, illness, worrying symptom or relevant medical condition with an appropriate healthcare professional rather than asking the chatbot to diagnose it; use NHS 111 at 111.nhs.uk or by calling 111 for urgent or worrying symptoms.
Copy the final sessions into your calendar or running app, then record what you actually completed and ask the chatbot to describe adjustments without increasing the workload to compensate for missed sessions.

Prompt

Create a cautious half-marathon training plan for me using the information below.

My target race date: [DATE]
My current weekly running: [DISTANCE, FREQUENCY AND TYPICAL PACE, IF KNOWN]
My longest recent run: [DISTANCE AND DATE]
My running experience: [BEGINNER, RETURNING, OR EXPERIENCED]
Days I can train: [DAYS]
Time available per session: [DETAILS]
Other exercise: [DETAILS]
Terrain and equipment: [DETAILS]
My age: [AGE]
Relevant medical conditions, previous injuries, pain or symptoms: [DETAILS]

First, identify any missing information that could materially change the plan. Do not diagnose me or tell me that a symptom is harmless. If I report urgent or worrying symptoms, tell me to stop and contact NHS 111 at 111.nhs.uk or by calling 111 rather than continuing to plan.

Then produce:
1. A week-by-week calendar from now to race day, with running days, rest days and optional cross-training.
2. The purpose and intensity of every session in plain language, using effort descriptions rather than invented pace targets where my information is insufficient.
3. A sensible progression that includes easier periods and recovery days.
4. A short warm-up, cool-down and fuelling checklist, clearly labelled as general information rather than medical advice.
5. Rules for what to do if I miss a session, feel pain, become ill or cannot recover between sessions.
6. A short list of assumptions and questions I should take to a qualified running coach or healthcare professional.

Do not invent my pace, fitness, injury history, race date or available time. Do not promise that I will finish or avoid injury. Keep the plan realistic and explain which parts I must check before following it.

Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.

What it gets wrong

AI cannot examine you or assess your running form, gait, pain or recovery in person.
AI cannot reliably distinguish normal training discomfort from an injury or other health problem.
AI cannot know whether the proposed progression matches your real effort, sleep, stress and recovery unless you report them accurately.
AI gives you a plausible calendar, not an accountable coach who watches your training and takes responsibility for changing it.

What caps this at PARTLY: stakes of error, judgement under ambiguity and verification cost.

How we scored this

Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.

Axis	Score (0–2)
Output	2
Inputs	1
Verification	1
Liability	1
Effort delta	2
Total	7 / 10

The methodology and its thresholds are published in full.

FAQ

Can AI create a half-marathon training plan for me?: Partly. A chatbot can create a structured plan from your race date, current running and available days, but you must check that the progression and recovery demands suit you. It cannot examine you or take responsibility if the plan contributes to an injury.
Is it safe to use AI for half-marathon training?: It can help with planning, but it is not a safety check or a diagnosis. Stop if you develop pain or other worrying symptoms and use NHS 111 at 111.nhs.uk or by calling 111 for urgent or worrying symptoms.
What information does AI need to make a running plan?: Give it your race date, recent weekly running, longest recent run, running experience, available days, other exercise, terrain, equipment, age and relevant injuries or health conditions. It should ask about missing information instead of inventing your pace or fitness.
Can AI adjust my half-marathon plan if I miss training?: Yes, it can suggest a revised calendar when you tell it what you missed and how you are recovering. Do not use it to justify cramming missed sessions into a shorter period, and stop for pain or worrying symptoms rather than asking it to explain them away.

Nearby answers

All Fitness & training rulings

Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.

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