Intensity: Heavy Duty Training

About this app

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/

Custom Workouts are here. Intensity Pro members can now build their own exercises with custom rep ranges, technique notes and muscle group tagging, then group them into named workouts alongside Mentzer's built-in exercises. Start any custom workout directly from the Log screen.

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1. First observed Aug 15, 2026 · 5:32 PM Free