FitnessAI

FitnessAI is an AI personal trainer app that programs weightlifting workouts for people who want to know exactly what weight to put on the bar. Its model is trained on a large pool of logged training sessions, and it uses that data to choose sets, reps and loads for each exercise, then adjusts after every workout. The emphasis is on short, efficient sessions and on showing you why the numbers changed.

What is FitnessAI used for?

FitnessAI acts as a programming engine for strength training. Instead of following a fixed PDF plan, you open the app, see today's workout with target weights, and log what you actually lifted.

• Getting specific weight, set and rep targets for every exercise
• Fitting workouts into 5 to 30 minute windows
• Adjusting automatically to the equipment available, including travel setups
• Following guided form videos and muscle diagrams
• Syncing performance from Apple Watch and adapting intensity when recovery is low
• Tracking strength gains and body composition with the 3D BodyScan feature

Who FitnessAI is best for

FitnessAI suits busy professionals and parents who have 30 to 45 minutes at the gym and do not want to spend any of it deciding what to do. It also helps lifters who have plateaued on generic programs and want data-driven progression. Athletes who follow a coach, people training mainly for endurance, and anyone who prefers designing their own split will find it restrictive.

FitnessAI pricing

FitnessAI is free to download and lets you get started before paying, but full use requires a membership. The website does not publish prices. As of October 2026 the App Store lists several membership options, including weekly, monthly, quarterly and annual plans, with in-app prices from $3.99 up to $89.99 depending on the billing period and offer. The site sometimes advertises discount codes. There is no team or enterprise plan for individuals. Check the paywall inside the app for the plan available in your region.

Limitations to keep in mind

• Prices are not published on the website
• Programming is built around weightlifting, so runners and cyclists will need another tool
• The algorithm needs honest logging to make good weight recommendations
• The website claims about training data and outcomes come from the company

FitnessAI vs alternatives

ChatGPT and Google Gemini can draft a lifting program and explain progressive overload, which is useful for learning, but they do not remember your last session or push the weights up automatically. LifeOS AI makes more sense if you want workouts tracked next to habits, sleep and goals in one dashboard. FitnessAI is the better choice for people who want a dedicated lifting app that hands them exact numbers for every set and keeps them under 30 minutes.

Tips for getting started with FitnessAI

Enter your real equipment and the smallest plate or dumbbell jump you can make, so recommended weights are ones you can actually load. Log reps truthfully, including failed sets, because that is what drives the next adjustment. Start with shorter sessions for the first two weeks to let the model calibrate before committing to longer workouts. If you wear an Apple Watch, connect it early so recovery data is in place when intensity starts to rise.

FitnessAI FAQ

Is FitnessAI free?

No. FitnessAI is free to download and start, but ongoing use requires a paid membership, with weekly, monthly, quarterly and annual options sold in the app.

How does FitnessAI choose my weights?

FitnessAI uses a model trained on millions of logged workouts to set weights, sets and reps, then raises or lowers them based on how you performed last time.

Is FitnessAI available on Android?

FitnessAI is primarily an iPhone app with Apple Watch support. Check the official site or Google Play for current Android availability before subscribing.

What is the best alternative to FitnessAI?

ChatGPT can write a free lifting plan if you are happy to track it yourself, while LifeOS AI suits people who want fitness inside a broader life tracker.