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Train Smarter With
AI personal trainer

Get instant feedback, personalized workout advice, and a coach that's always by your side.

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How AI Personal Trainer helps

  • Know your fitness level

    Complete a short AI Fitness Test on camera. Muscle Booster measures your fitness score and uses it to set the right starting point for your plan.

  • Real-time coaching while you train

    Work out with your camera on and get live feedback on your form and performance.

  • A full breakdown after every session

    When your workout ends, your AI coach gives you a detailed summary of your performance.

  • Ask your AI coach anything

    Got a question about your plan, your exercises, or how to reach your goal faster? Your AI coach is always there to answer.

  • A plan that keeps getting better

    The more you train, the smarter your plan gets. Your AI coach continuously refines your workouts based on your performance, feedback, and progress over time.

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Other Features

  • Personalized workout plan

    Personalized workout plan

    Follow a plan built around your goals, fitness level, and available equipment.

  • Workout creator

    Workout creator

    Pick how you like to train and get your session ready in seconds.

  • Nutrition

    Nutrition

    Daily meal plans & nutrition advice to support muscle growth, energy, and long-term progress.

  • Award
    3000+
    exercise library
  • Award
    70M+
    downloads
  • Award
    4.6
    rating*
    *based on 128,000 AppStore ratings

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Why people love Muscle Booster

  • By far the best App I’ve found

    By far the best App I’ve found. Flexible programs, adjustable, and enjoyable!

    nomisb3

  • After one week +I feel better, and will continue.

    I started more than a week ago, it is a clear and easy to follow, The timing is good, the exercises are well explained. I enjoy it, and will continue.

    zeev jonas

  • Perfect workout to start the summer! The workout was so easy to register and…

    The workout was so easy to register and follow the directions. The trainer shows and explains at the same time what to do . The workout starts slow and adjusts to the person’s level of readiness for the next lesson. I haven’t exercised in years , this was a perfect start! It works well. This app is the best I tried . Only a couple reminders throughout the day. Simple and easy.

    Mary

  • I really like the workouts…

    You can customize length and difficulty. Better than others I have tried.

    Drums18

  • A variety of exercises, adapted to my abilities.

    After 3 weeks, I'm rediscovering some forgotten muscles.

    Serge Lizzola

  • Workout catered to your injuries

    I am broken. I have lower back problems with pressure on a nerve going down my left leg, I also have neuropathy with balance problems. The app allows you to enter injuries and prepares a workout catered to your injuries. After you do a workout, the app asks for feedback on each exercise and if you found an exercise too difficult, the app will make adjustments to your workout.

    D.M.

  • Taking care of me

    I’m 56 years old and I had triple bypass about a year ago. I decided to do better and exercise regularly. I love this app. I like the diversity of it and I can pick the workout that I want to do.

    dustypsalms

  • I've used this app for two years.

    I've used this app for two years. Great results. Lots of variety. Good feedback and tracking of progress.

    Jim Stacey

  • Needed something to get me moving and committed again.

    This is a great way to reach daily goals

    JayCee 51

  • I really like the app.

    I use it almost daily. It has exercises for all levels and they're quite comprehensive.

    Ippolito Garzaro

  • Muscle Booster has been great in it's…

    Muscle Booster has been great in it's approach to improve my physical as well as mental health. This process has proven to be what I needed to improve my physical and mental health for my age.(70)

    oliveroree

  • PHENOMENAL

    I'm 69 years old, it has improved my mobility, flexibility, and balance, very easy to follow!

    William R Peguero

  • This program is making me feel much better…

    This program is making me feel much better even after the first few days.

    Chris Polo Barnes

  • Very well done, easy to follow, and with consistent support.

    Very well done, easy to follow, and with consistent support. The exercises are well explained. A very good app.

    Marc Drolet

FAQ

Find answers to your questions about Muscle Booster.

How does the AI Personal Trainer work?

Muscle Booster's AI Personal Trainer works across three areas — before, during, and after your workout. Before you start, it assesses your fitness level through a short camera-based test. During your workout, it analyzes your form in real time and gives live feedback. After your session, it delivers a detailed performance summary and uses everything it learns to keep refining your plan over time.

What is AI workout feedback?

AI workout feedback is real-time coaching during your session. Train with your camera on and Muscle Booster's AI analyzes your movement, identifies form issues, and gives you immediate guidance. At the end of your workout, you get a detailed summary of your performance with specific advice on what to focus on next time.

How can AI Fitness Chat help me?

AI Fitness Chat lets you ask your Muscle Booster coach anything — about your workouts, your plan, your exercises, or how to reach your goal faster.

What does the AI Fitness Test measure?

The AI Fitness Test uses your phone's camera and pose-detection technology to analyze your movement and measure your fitness score. Complete a few quick exercises on camera and the app assesses your form, performance, and physical capability — then uses that score to set the right starting point for your personalized plan.

Can the AI Personal Trainer adapt to my fitness goals?

Yes. Muscle Booster's AI Personal Trainer is built around your specific goal from day one, whether that's losing weight, building muscle, or improving overall fitness. As you train, the AI continuously refines your plan based on your performance, feedback, and progress.