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Fitness challenges by Muscle Booster

Stay motivated and turn every challenge into a fitness milestone.

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Join a fitness challenge today

  • Fits into your existing plan seamlessly

    You don't have to choose between your workout plan and a challenge — both run side by side.

  • Keep your training fresh

    43% of Muscle Booster users join challenges to experiment with new workouts.

  • Designed by fitness experts

    Every challenge is created by top fitness experts, so you can trust that what you're doing is safe, effective, and worth your time.

  • A challenge for every goal

    Mobility, strength, calisthenics, pelvic health, and more — whatever you're working on, there's a challenge for it.

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Challenges you can add to your routine

Popular challenges to add variety and structure to your training.

Other Features

  • Workout creator

    Workout creator

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

  • AI coach

    AI coach

    Get workout feedback, tailored training advice, and answers to all your fitness questions.

  • 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

Featured in

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Why people love Muscle Booster

  • 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

  • Needed something to get me moving and committed again.

    This is a great way to reach daily goals

    JayCee 51

  • 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.

  • I really like the app.

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

    Ippolito Garzaro

  • 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

  • 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

  • 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 really like the workouts…

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

    Drums18

  • PHENOMENAL

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

    William R Peguero

  • 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

  • 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

  • By far the best App I’ve found

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

    nomisb3

  • A variety of exercises, adapted to my abilities.

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

    Serge Lizzola

FAQ

Find answers to your questions about Muscle Booster.

How do fitness challenges work?

Fitness challenges in Muscle Booster are additional workout programs that run alongside your main personalized plan. When you join a challenge, a short daily workout — 10 to 30 minutes — is added to your schedule for the duration of the challenge, which can last anywhere from 7 to 28 days.

Are fitness challenges suitable for beginners?

Yes. Muscle Booster's fitness challenges are designed for all levels, including complete beginners. Every challenge is created by fitness experts with safety and effectiveness in mind, and because challenge workouts are short and focused, they're a great way to ease into new types of training without feeling overwhelmed.

Can I combine challenges with my workout plan?

Absolutely, that's exactly how they're designed to work. Challenges don't replace your personalized workout plan, they add to it. Your main plan keeps running as normal, and your daily challenge workout sits alongside it in your schedule.

How long are the fitness challenges?

Muscle Booster's fitness challenges run for 7 to 28 days, with individual sessions lasting 10 to 30 minutes.

Do fitness challenges help build consistency?

Yes, and that's one of the main reasons our users join them. A challenge gives you a clear goal and a fixed timeline, which makes it easier to show up every day. The short daily sessions are low enough in effort to feel manageable, and the end date is close enough to keep you motivated.