Intensity: Heavy Duty Training
Health & Fitness
Only for iPhone
Free · In‑App Purchases · Designed for iPhone. Not verified for macOS.
iPhone
Train less. Grow more. The only app built on Mike Mentzer's Heavy Duty method - one set, maximum effort, complete recovery.
Intensity is the only training app built entirely on Mike Mentzer's Heavy Duty method - the most rational, science-based approach to building muscle ever devised.
One set. Maximum effort. Complete recovery. That's it.
Most training apps encourage you to do more. Intensity tells you the truth: more is not better. Only harder is better. The body grows during rest - not in the gym. Train less, recover fully, grow more.
WHAT'S INSIDE
The Ideal Programme - three workouts covering every major muscle group. Chest & Back, Legs & Abs, Shoulders & Arms. One working set per exercise, taken to absolute failure.
The Consolidated Programme - two workouts of pure compound movements for advanced trainees whose progress has stalled on Ideal.
Recovery tracking - a readiness score calculated from your inroad depth and days rested. The app tells you when your body is genuinely ready to train again, not just when you feel like it.
Daily check-in - four recovery signals scored into a readiness verdict. Energy, motivation, soreness, appetite. Honest answers only.
Progression tracking - every set logged, every PR detected. Weight and reps charted over time. If you're not stronger every session, something has gone wrong.
Exercise library - all 16 Heavy Duty exercises with technique notes, rep ranges, and approved substitutes sourced from Mentzer's published work.
Overtraining alerts - train too soon and the app will tell you. Four scenarios based on your inroad depth and days since last workout.
Urgency timer - a 5-second countdown between pre-exhaust and compound movements to maintain the physiological link that makes the pre-exhaust technique work.
THE METHOD
Every feature in this app traces back to a specific principle Mike Mentzer argued for in print. Nothing has been added that contradicts his published methodology.
Primary source: High-Intensity Training the Mike Mentzer Way - Mike Mentzer with John Little, McGraw-Hill, 2003.
Intensity is an independent app and is not affiliated with, endorsed by, or officially connected to the estate of Mike Mentzer or any related parties.
Intensity Pro unlocks full recovery analytics, daily check-in, progression charts, the complete exercise library, body composition tracking, and unlimited session history.
Free tier includes the full workout logger and four foundational exercises.
Terms of Use: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/
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The developer, Adam Khan, 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:
- Purchases
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Identifiers
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- Adam Khan
- Size
- 36.6 MB
- Category
- Health & Fitness
- Compatibility
Requires iOS 15.1 or later.
- iPhone
Requires iOS 15.1 or later. - iPod touch
Requires iOS 15.1 or later. - Mac
Requires macOS 12.0 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 1.0 or later.
- iPhone
- Languages
- English
- Age Rating
9+
- 9+
- Contains
Health or Wellness Topics
- In-App Purchases
Yes
- Intensity Pro $9.99
- Copyright
- © 2026 Adam Khan