MustDuo
Workout tracker with AI coach
Only for iPhone
Free · Designed for iPhone. Not verified for macOS.
iPhone
Your AI gym coach plans your week, swaps a lift when the rack is taken, and shortens a session to the minutes you have. Try 3 workouts free, no account needed.
MustDuo is your lifting partner that plans your fitness journey and adapts as you progress, helping you train smarter and reach your goals.
Meet Naya, your personal coach and biggest cheerleader. She knows your goals, your plan and your recent training, so you can chat with her about your workouts, ask questions, or adjust your session when you need an easier day.
Log each set with a tap, or pair the MustDuo Tracker to count reps for you. Watch your progress in charts, workout receipts and Apple Health.
Whether you're new to lifting or chasing your next PR, MustDuo takes the guesswork out of training, makes every workout count, and helps you build a habit that lasts.
YOUR PLAN, YOUR WEEK
Choose your goal, experience level, and training schedule. MustDuo builds your personalized weekly plan and adapts it when life gets in the way. Swap exercises, shorten sessions, lighten a workout, or move it to another day with Naya.
NAYA
Your personal coach, right in your pocket. Ask questions, get training guidance, and adjust your workouts when life gets in the way.
WORKOUTS
Follow your personalized workout with pre-filled sets and reps, easy set tracking, and smart rest timers. Spend less time on your phone and more time focused on your lift.
EXERCISE LIBRARY
Explore 200+ exercises, most with HD demo videos, to help you learn proper form and train with confidence.
PROGRESSIVE OVERLOAD, HANDLED
Progressive overload made simple. MustDuo remembers your lifts and gradually adjusts your weights as you hit your targets, helping you consistently challenge yourself and get stronger.
THE DASHBOARD
See your strength, training volume, and consistency at a glance. Track trends over time and get clear insights on what to focus on next.
YOUR WORKOUT RECEIPT
See everything you accomplished: volume, reps, time, and a fun real-world comparison. Compare each workout to your previous session and share your progress.
THE WINS TAB
Build momentum with streaks, personal records and your workout receipts, and invite friends to train with you. Earn bananas and level up on your profile.
THE MUSTDUO TRACKER, IN EARLY ACCESS
Pair the MustDuo Tracker and it counts your reps, changes the weight and moves you through your workout without touching your phone. The tracker is in early access, and the app is fully functional without it.
APPLE HEALTH
Keep your fitness data connected. Sync your workouts with Apple Health and see your training alongside the rest of your activity.
TRY IT FIRST
Start a workout or plan your week from the first screen. Do 3 workouts as a guest before creating an account.
Just lift. MustDuo handles the rest.
A new first screen, a quick tour, Dark Mode, one weight unit setting, and lots of fixes.
New
- New first screen: start a 30-minute workout or plan your week before signing up.
- A quick tour on Home shows you around. Replay it any time from Settings.
- Dark Mode: Light, Dark or Auto in Settings.
- Set pounds or kilograms once for workouts, charts and receipts.
- Runs, rides and classes from Apple Health now show on your week and in History.
- Ended today's workout by mistake? Reopen it and tap Start Over.
- Leaving a workout that won't count now offers Discard Workout.
- Add or remove 15 seconds of rest.
- Ask Naya to go lighter mid-workout: she'll lower the weight on your remaining sets and may cut a set or two.
- Naya chat adds starter questions and How Naya works (also in Settings), explaining where your messages and training go.
- Add your body weight in Edit Profile (optional) so Naya can judge how heavy a lift is for you.
- Circuits run station to station in rounds; intervals show effort zones and coaching cues.
- Search exercises by muscle or equipment.
Fixes
- Timed sets and the lock screen rest timer keep time with your phone locked.
- Resuming keeps your Duration accurate, and Pause for 2 Hours clears the lock screen card.
- Workouts save to Apple Health even with Active Energy sharing off.
- No reminders or streak nudges mid-workout or for workouts you've already done.
- The "Your week" widget and workout receipts stay accurate, even offline.
- Better layouts at larger text sizes, and VoiceOver announces rest ends and Naya replies.
The developer, MustDuo, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Linked to You
The following data may be collected and linked to your identity:
- Health & Fitness
- Contact Info
- User Content
- Identifiers
- Usage Data
- Diagnostics
- Other Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Diagnostics
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- MustDuo LLC
- Size
- 58.1 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 18.5 or later.
- iPhone
Requires iOS 18.5 or later. - Mac
Requires macOS 15.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 2.5 or later.
- iPhone
- Languages
- English
- Age Rating
13+
- 13+
- Infrequent
Medical Treatment information
Contests
Contains
Health or Wellness Topics
- Copyright
- © 2026 MustDuo LLC
