How do I actually follow this run once the AI writes it?

Paste the AI's reply into sweatcue. It structures the session into timed blocks with auto-starting rest timers and calls every set, rest and rep out loud, so you train hands-free instead of scrolling a chat window.

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Running · Endurance

Threshold tempo run

Q: What is the best ChatGPT prompt for a running workout like this?

Use the research-backed prompt on this page: "Write me a 40-minute tempo run. After a 10-minute easy warm-up, give me 20 minutes continuous at threshold — "comfortably hard", around my 10k to 15k effort, heart-rate Zone 4, a pace I could just about hold for an hour …" Copy the full version with the button above — it wraps the request so ChatGPT, Claude or Gemini returns a clean, followable run you can run hands-free in sweatcue.

Intermediate · 25–39 · ~40 min

Comfortably hard — raises the pace you can hold before fatigue bites. 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

Duration~40 min

FormatSteady aerobic effort

FocusThreshold

IntensityZone 4

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).

Write me a 40-minute tempo run. After a 10-minute easy warm-up, give me 20 minutes continuous at threshold — "comfortably hard", around my 10k to 15k effort, heart-rate Zone 4, a pace I could just about hold for an hour — then a 10-minute easy cool-down. Keep me from drifting too fast: this should feel controlled, not a race. Give each block a duration and a target heart-rate zone.

Works with Claude, Gemini, Grok or any AI.

Why it's built this way

A sustained ~20-minute "comfortably hard" effort at your lactate-threshold pace trains you to hold a faster pace before fatigue sets in. Keep it a minority of your week — most running should still be easy.

Sources: Daniels, Daniels' Running Formula, 3rd ed., Human Kinetics 2014; Seiler, Int J Sports Physiol Perform 2010

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 →

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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.