How do I actually follow this HIIT workout 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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HIIT · Build muscle

Low-frequency conditioning for gainers

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

Use the research-backed prompt on this page: "I'm a skinny hardgainer male under 25 eating in a surplus to gain muscle, but I still want some cardiovascular fitness without burning lots of calories or hurting recovery from lifting. Give me a 12-minute conditioning s…" Copy the full version with the button above — it wraps the request so ChatGPT, Claude or Gemini returns a clean, followable HIIT workout you can run hands-free in sweatcue.

Beginner · Under 25 · ~12 min

A short, infrequent conditioning hit for the heart that won't eat your hard-won calories. Below is a research-backed prompt for ChatGPT, Claude or Gemini — copy it, paste the reply into sweatcue, and run the whole HIIT workout hands-free.

Session at a glance

Duration~12 min

FormatTimed intervals

FocusMinimal

IntensityRPE 8

Equipmentrower, bike

Best forBuild muscle, beginner

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).

I'm a skinny hardgainer male under 25 eating in a surplus to gain muscle, but I still want some cardiovascular fitness without burning lots of calories or hurting recovery from lifting. Give me a 12-minute conditioning session I can do just once or twice a week on a bike or rower. Include a 3-minute easy warm-up, then a short interval set: 4 rounds of 30 seconds hard (about 85-90% of max heart rate, RPE 8-9) with 90 seconds easy spinning between, then a 2-minute easy cool-down. Tell me how to set the resistance, how hard 'hard' should feel, and why I should keep this short and low-frequency while bulking.

Works with Claude, Gemini, Grok or any AI.

Why it's built this way

Brief, low-volume interval sessions can improve cardiorespiratory fitness with little total time and energy cost, which suits someone trying to stay in a surplus. Cardiorespiratory fitness is strongly tied to long-term health, so some is worth keeping. Keeping volume and frequency low limits interference with strength and hypertrophy goals.

Sources: Gibala et al., J Physiol 2006 (low-volume sprint-interval training); Kodama et al., JAMA 2009 (cardiorespiratory fitness & mortality)

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 hiit & related workouts

WeightsSkinny-gainer full-body mass session Weights · PlanHardgainer upper/lower split (8 weeks) BodyweightHardgainer home muscle session MobilityPre-lift mobility for new lifters

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.