Your AI fitness coach

An AI fitness coach that knows your training.

Ask ChatGPT or Claude about your progress. With Simple Muscle, it can review your actual sets, reps, and weights, then help you decide what to do next.

Create free account Connect your AI →
Example conversation

How’s my barbell curl going? Should I add weight?

ChatGPT

Over 12 weeks your best set went from 10 × 20 kg to 8 × 27.5 kg, and both sets last session hit 8 × 27.5 kg. I’d hold 27.5 kg until you get 10 reps, then move to 30 kg. Want me to update Arm Strength?

12 weeks of Barbell Curl reviewed
Simple Muscle iPhone screen showing Barbell Curl progress with a best set of 27.5 kg over 12 weeks and the recent sets
Illustrative example. Replies depend on your assistant and on what you have logged.

Make your workout log useful in a conversation.

See what improved

Ask how your weights and reps changed over the last few weeks. Your AI can look up the sessions behind its answer.

Understand a stall

Compare recent workouts and ask what might explain a plateau. Add context about sleep, effort, or a busy week when it matters.

Choose the next step

Ask for a small adjustment to your next workout. Review the reason and the proposed change before saving it.

Try asking

“What should I change next week?”

Connect Simple Muscle, log a few workouts, then ask your AI for a review. You can follow up in the same chat.

Set up ChatGPT or Claude →
Training progress review
Review my last four weeks in Simple Muscle. How consistently did I train? Where did my reps or weights improve, and where did they stall? Use my logged sets, explain what you found, and suggest one useful change. Show me the change before saving it.

Log the work. Keep your AI in the loop.

Follow your plan in the iPhone app and record each set. Sync brings that training history to your account, ready for ChatGPT or Claude when you ask.

Your AI works with what you record. It can compare numbers and explain patterns; it cannot see your form or know how a session felt unless you tell it.

Web accounts and AI connections are free. iPhone sync is free for 7 days, then $5/month or $50/year. See pricing →

Questions

AI fitness coach FAQ

How does Simple Muscle work as an AI fitness coach?
Simple Muscle connects your workout plans and logged training to ChatGPT, Claude, or another compatible AI assistant. Ask your AI to review your progress, explain a pattern, or help adjust your next workout. You keep using the assistant you already know.
What can my AI see?
After you connect your account, your AI can request your plans, completed workouts, sets, reps, weights, and exercise history. It uses the data you have logged, so consistent tracking gives it more to work with. You can disconnect your AI to stop future access.
Does it review every workout automatically?
You can ask your connected AI for a review whenever you want. Optional workout analysis has a separate setup in ChatGPT and stays off until you enable it. Connecting your account alone does not turn on automatic reviews.
Can the AI change my workout history?
No. Completed workouts stay unchanged. Your AI can review them and help update future workouts. Ask it to show you a proposed change before saving it.
Is the AI connection free?
Your Simple Muscle web account and AI connection are free. iPhone cloud sync is free for seven days, then $5 a month or $50 a year. The iPhone tracker works offline for free. Your AI provider may have its own fees or account requirements.
Does this replace a personal trainer?
Your AI can help plan and review training, but it cannot watch your form, diagnose an injury, or provide medical care. Use qualified professional guidance for pain, injuries, or a medical condition.

Give your AI something to coach from.

Connect your account and start a conversation about your training.

Create free account

Need a plan first? See how AI workout planning works →