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Marathon plan (16 weeks)

Intermediate · 25–39 · 16-week plan · 4 to 5 days a week

Sixteen weeks built on easy volume and a long run that climbs to race-ready. Below is a research-backed prompt for ChatGPT, Claude or Gemini, copy it, paste the reply into sweatcue, and run the whole run hands-free.

Session at a glance

Duration16-week plan · 4 to 5 days a week
FormatTimed intervals
Focus16 weeks
IntensityZone 2
EquipmentJust you (a watch helps)
Best forEndurance, intermediate

This is how sweatcue structures the session once you paste it in, timed blocks with auto-starting rest and spoken cues. Figures are read from the prompt itself.

The prompt

Copy the complete prompt (it wraps the request below so the AI returns a clean, runnable session).

Build me a 16-week marathon training plan, running 4 to 5 days a week. Base it on a polarized approach, about 80% easy conversational running (heart-rate Zone 2) and 20% harder (a weekly tempo and some intervals), with a long run that gradually builds toward around 32 km (20 miles), stepping back every few weeks to recover, and a 2 to 3 week taper before race day. Add one optional strength session a week. For each training day list the week, and the run as a duration or distance with a target effort or heart-rate zone. Include the rest days.
Works with Claude, Gemini, Grok or any AI.

Why it's built this way

Marathon training is built on a large base of easy, conversational mileage with a smaller share of harder work, and a long run that progressively lengthens (with recovery weeks) toward about 32 km before a taper. Adding a little strength training improves running economy without harming the aerobic engine.

Sources: Seiler, Int J Sports Physiol Perform 2010 (80/20 distribution); Stöggl & Sperlich, Front Physiol 2014 (polarized training); Blagrove, Howatson & Hayes, Sports Med 2018 (strength & running economy)

Who this plan is for

Built with one person in mind: 30s, run a few times a week, training toward a strong 5k to half-marathon.

  • You’re an intermediate-level trainer and you want a bigger aerobic engine.
  • You have access to the kit it calls for: just you (a watch helps).
  • You want a structured, progressing plan rather than a one-off session.

Who should adapt or skip it

  • It’s low-risk for healthy adults. Scale the loads and reps to your own level rather than copying the top of every range on day one.
  • As with any new routine, check with a clinician first if you have a medical condition, are injured, pregnant, or returning from a long lay-off. This is general information, not medical advice.

What a 2-week plan looks like

This is a multi-week plan that progresses as you go, the AI builds the later weeks harder. Here’s the rhythm of the opening fortnight, at about 5 sessions a week:

MonTueWedThuFriSatSun
Week 1●●●·●●·
Week 2●●●·●●·

● This session· Easy cross-training or rest

Keep session days apart where you can, and adjust for how you feel. When you paste the AI’s reply into sweatcue, each session runs hands-free with spoken cues and timers.

Run it hands-free in sweatcue

sweatcue is an AI workout dashboard: paste the AI's reply and it runs the whole session on screen and out loud, auto timers, spoken cues for every set, rest and rep, and your live numbers. The AI writes it; sweatcue runs it.

Download for iPhone →

More running & related workouts

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New to prompting an AI for workouts?

Start with the full workout library, learn the method in how to write a workout prompt, or see what an AI workout dashboard does.