Guide
Using ChatGPT for your workout plan
ChatGPT can write a good plan. The trouble starts in week two, when you are the one carrying every set between your log and the chat.
What ChatGPT does well
- Writes a full program in seconds from a few lines about you.
- Explains its choices: why this rep range, why this exercise first.
- Swaps an exercise when your gym doesn't have the machine.
For a first plan, that is a fine place to start. How good the plan is depends almost entirely on what you tell it.
What to tell it
- Your goal. Strength, muscle, a meet, or general fitness.
- Your week. How many days you can train and how long each session can run.
- Your equipment. Full gym, home rack, dumbbells only.
- Your numbers. A recent working set on each main lift is enough.
- What bothers you. Injuries, and lifts that don't sit right.
- How hard each set should be. Ask for a target in reps in reserve (RIR): "2 RIR" means you stop with 2 good reps left.
- How it moves. Ask exactly how the weight goes up each week, and when to deload.
Write me a 12-week strength program, 4 days a week, 60 minutes a session, in a full commercial gym. Goal: get stronger on squat, bench and deadlift and add some muscle. Recent sets: squat 225x5, bench 165x5, deadlift 275x5. Deep lunges bother my right knee. Give every set a target RIR, tell me exactly how to add weight each week, and plan a deload.
Where it breaks once you start training
It only knows what you type
A chat doesn't see your workouts. To adjust next week, you paste in what happened. Most people paste the sets that went badly and skip the rest, so the plan adjusts on half the picture.
You become the middleman
You log in one app and get coached in another, and you copy sets between them. That works for a week. It rarely lasts a training block.
It isn't there mid-session
When a top set moves faster than planned, the rest of the day stays as written unless you stop, open the chat and ask.
I've lifted since I was 14 and have competed in powerlifting. In late 2025 I planned my training with ChatGPT and logged it in a workout app. It worked fairly well, but what I told it a few days earlier didn't carry over to the next conversation.
I moved to Claude, which remembered more. I was still typing out the sets that mattered and sending screenshots of the rest. I was the middleman between my log and my coach, so I built one app that is both.
What Aldo Coach does instead
The plan and the log are one thing. Log a set and the coach already has it. Nothing to paste.
It answers under the set you just did. Log a set with how many reps you had left, and the coach sets your next weight and says why. Finish a top set easier than planned and the back-off sets go up, one tap to accept or keep them.
It plans around your real week. Sync your Apple Calendar and a work trip or a late shift becomes part of the plan.
It remembers. Your injuries, your PRs on every exercise, and the lifts you like and don't.
The coach is Claude. Claude Opus writes your program and Claude Sonnet coaches you set by set. There's an Apple Watch app for logging on your wrist.
Which one fits you
Stick with ChatGPT if
- You like building and tweaking your own plan.
- You're happy to log in one place and plan in another.
- You mostly want ideas, not a coach on every set.
Try Aldo Coach if
- You want the plan to change as you train, not after you report back.
- You're tired of copying sets between apps.
- You train on an iPhone, or want to use it in a browser.
The limits: Aldo doesn't track food. It's in English only. The App Store app covers the US, Canada, the UK, the EU, Iceland and Norway; anywhere else, it runs in your browser.
Questions
Can ChatGPT make a good workout plan?
Yes, if you give it your goal, schedule, equipment, current numbers and any injuries. The weak spot is adjusting the plan as you train, because a chat only sees what you paste into it.
Is it safe to follow an AI workout plan?
Give it honest numbers, so the plan starts where you actually are, and stop any lift that hurts. An AI plan is not medical advice. For an injury, see a doctor or physical therapist.
Does Aldo Coach use ChatGPT?
No. The coach in Aldo Coach is Claude, made by Anthropic.
Is Aldo Coach free?
Yes, right now, with nothing for sale in the app. Every set you log goes to Claude, which costs money per user, so paid tiers will come later.
Let the plan keep up with you.
Your program, your log and your coach in one app.