Muscle Mastery
L8R Lifestyle, LLC Health & Fitness iPhoneiPadiPod touchApple Watch
Muscle Mastery is a free Health & Fitness app for iPhone and iPad by L8R Lifestyle, LLC. Rated 5.0/5 from 95 ratings. Requires iOS 15.5.
- Rating
- 5.0
- 95 ratings
- Price
- Free
- on the App Store
- Size
- 164 MB
- Age 4+
- Updated
- Oct 23
- 2026 · v8.18.10
Screenshots
About Muscle Mastery
Your program lives here. This is where the work happens. Muscle Mastery is a private coaching brand built by Jeff Later, IFBB Pro, with over 24 years of experience and 8,000+ client transformations. The method is built on four phases: Prime, Prove, Power, Polish. A system designed to change your body and what you believe is possible for it. If you're a Muscle Mastery client, this app is your home base. Your training program, your nutrition plan, your check-ins, and your coach, all in one place. No confusion about where to go or what to do next. Open the app, follow the plan, submit your check-in, and move forward. -Access your custom training program with video instruction and exercise guidance -Log your workouts including weight, sets, reps, and personal records -Submit weekly check-ins directly to your coach with photos, measurements, and notes -Reference your nutrition plan and track your daily macros -Message your coach directly through in-app messaging -Track body weight, measurements, and progress photos over time -Check daily habits set by you and your coach -Get push notifications for scheduled sessions and coach updates -Connects to Apple Watch and Apple HealthKit, Fitbit, and Withings to sync body stats This app is for Muscle Mastery clients only.
Ratings & reviews
5.0
95 ratings
What’s new
Version 8.18.10 · Updated October 23, 2026
Bug fixes and performance updates.
App privacy
The developer, L8R Lifestyle, LLC, reported these privacy practices to Apple.
Data Linked to You
The following data, which may be collected and linked to your identity, may be used for the following purposes:
- Usage Data: Product Interaction, Other Usage Data
- Diagnostics: Crash Data
- Health & Fitness: Health, Fitness
- Contact Info: Email Address, Name, Phone Number, Other User Contact Info
- Contacts: Contacts
- User Content: Photos or Videos, Audio Data
- Identifiers: User ID
- Sensitive Info: Sensitive Info
Used for: Analytics, App Functionality
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| App | Rating | Price | Last updated | Compare |
|---|---|---|---|---|
| Muscle Mastery | 5.0 / 5 (95 ratings) | Free | October 23, 2026 | |
| Naked Training | 4.8 / 5 (1,020) | Free | Oct 20, 2026 | Compare |
| Alexia Clark | 4.8 / 5 (4,002) | Free | Oct 21, 2026 | Compare |
| Chalk Performance Training | 3.8 / 5 (166) | Free | Sep 17, 2026 | Compare |
| Intermountain Health | 3.9 / 5 (3,715) | Free | May 4, 2026 | Compare |
| Select Health | 4.7 / 5 (5,329) | Free | Oct 7, 2026 | Compare |
| Rythm Health | 4.8 / 5 (34) | Free | Oct 28, 2026 | Compare |
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