How do I use AI as a gym coach?

Brendan McNulty logged every set to Claude for six weeks. It found McNulty was badly underloading, built a simple program, and McNulty's squat went from 25 kg to 70 kg.

Steps

1. Spend the first week logging your normal workouts so the AI sees where you are.
2. Log each set during the session: exercise, sets, reps, weight and how the form felt.
3. Agree a simple progression rule (McNulty's: add 5 kg after all sets with good form).
4. Tell it about any pain, and get pain checked by a professional.
5. Film your form if it asks. McNulty skipped this and hurt their back.

Prompts

Squats 3×8 at 65kg, form felt good, depth was better

Recommended tools

Claude · ChatGPT (opens in our AI Directory)

Watch out: AI can't see your form unless you show it. See a professional for injuries.

The real plays behind this guide