As of 13 August 2026, AI can only partly create an effective 20-minute workout.

What to actually do

1. Use a tool built for this

   The route this page recommends

2. Do it yourself

   Second choice

   A chat interface, chat-fluent skill, and roughly 30 minutes until you can act on the result.

   How to actually do it

   1. Open a chatbot and gather your goal, fitness experience, available equipment and space, plus any current pain, injuries, medical conditions, pregnancy or recent surgery.
   2. Paste the supplied prompt and replace every bracketed slot with your own details, writing "none" where it genuinely applies.
   3. Ask the chatbot to regenerate the plan if any exercise needs unavailable equipment, conflicts with your limitations or does not fit exactly into the available time.
   4. Open NHS guidance at nhs.uk and compare any health-related warning in the response with the advice there; use NHS 111 or 111.nhs.uk for urgent or worrying symptoms.
   5. Read the exercise instructions and practise each movement slowly without the workout timer, removing any movement that causes pain or feels unsafe before starting.
   6. Follow the timed plan at an easy intensity first, stop for sharp, severe or unusual pain, chest pain, faintness, severe breathlessness or other worrying symptoms, and record which exercises felt suitable for the next version.

   Prompt

   Create a safe, effective 20-minute workout for me using the details below.
   
   My goal: [strength, cardiovascular fitness, mobility, general fitness or other]
   My fitness experience: [beginner, intermediate or advanced]
   My age range: [for example, under 18, 18 to 64, or 65 plus]
   Available equipment: [list equipment or say none]
   Available space: [describe it]
   Exercises I already tolerate well: [list them]
   Exercises I need to avoid or dislike: [list them]
   Current injuries, pain, medical conditions, pregnancy or recent surgery: [describe these, or say none]
   Time available: exactly 20 minutes
   
   Do not diagnose me or assume that an exercise is safe because I have not mentioned a medical issue. If my information suggests that I need individual medical or exercise advice, say so before giving the plan. If I report urgent or worrying symptoms, tell me to contact NHS 111 or use 111.nhs.uk rather than continuing.
   
   Give me:
   1. A brief safety screen and the situations in which I should stop and seek help.
   2. A minute-by-minute plan adding up to exactly 20 minutes, including warm-up and cool-down.
   3. Clear instructions for each exercise, including posture, breathing, pace and an easier alternative.
   4. A simple intensity guide that does not rely on specialist equipment.
   5. The main muscles or fitness qualities each part targets.
   6. A short explanation of why the plan fits my goal, equipment and experience.
   
   Use plain UK English. Do not promise results. Do not include exercises that need equipment I do not have. Tell me to stop for sharp, severe or unusual pain, chest pain, faintness, severe breathlessness or other worrying symptoms, and to seek appropriate medical help.

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

3. Hand it to a person

   The distant third

   A person who owns the outcome does this end to end, worth it when the failure is dear.