First Look: Dr. Muscle X New Features & Improvements
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Dr. Muscle: The AI Workout App With 27+ Features You Won't Find Anywhere Else
Built by an exercise scientist, updated 50+ times per year—from progressive overload to daily undulating periodization, here's what makes Dr. Muscle the smartest trainer you'll ever have
Smarter. Smoother. Faster. Be The First To Try The New Dr. Muscle
Meet Dr. Muscle X: The Future of AI Personal Training. Early Preview Now Open.
Smart Training. Simplified. Dr. Muscle Coming to Apple Watch.
Power meets simplicity. Innovation meets iron. Right on your wrist.
A Smarter, Better Way To Build Muscle: The Dr. Muscle Manifesto
No hype, no gimmick—just science-backed workouts that grow with you using AI
MacroFactor App Review 2025 by Independent Expert—Results, Price & More [In-Depth]
An honest look at MacroFactor and results from 9 users of the app: is it worth it in 2025?
Latest articles
Back-off sets!
Goto et al. (2004) studied back-off sets. They found that lifters who did back-off sets gained more strength and endurance than those who did not. There was also a trend (p = 0.08) for more muscle gain. Good news! Dr. Muscle now automates them for you. You'll do
Over Time, Load Mediates Muscular Hypertrophy in Resistance Training
Our letter to the editor is out! In August, Morton et al. (2019) published a review titled Training for strength and hypertrophy: an evidence-based approach. In that paper, they argue that “load does not mediate resistance-training-induced muscular hypertrophy.” Instead, they suggest that “the most potent regulator of resistance-training-induced muscular hypertrophy
Log in With Google
You can now log in with Google. Also: more custom tips as you create your account, improved UX/UI of workouts and menus, and 3 work sets for new exercises (up from 2).
Mesocycle Progression in Hypertrophy: Volume Versus Intensity
I co-authored a review titled Mesocycle Progression in Hypertrophy: Volume Versus Intensity with Mike Israetel (Israetel et al. 2019). It was published on Dec 11. How should you progress in a mesocycle? From the abstract: “Should the trainee add more add more weight to the bar each week, add repetitions
App loads 36% faster
You can now work out with fewer and shorter load times. In our tests, the app now loads 36% faster (opening a workout, doing 4 sets of an exercise, and saving it now takes 31 seconds, down from 48).
Users like you improve XX% in 30 days
If you're a new user, you'll now see how fast other new users usually improve (e.g. "Users like you improve XX% in 30 days").
Better coaching tips during workouts
You'll now get better coaching tips during your workouts (e.g. "10 x 200 lbs 3 days ago—now try:").
New Interface!
New faster, cleaner interface, including a revamp of workouts that lets you reorder exercises with drag and drop.
Popular life extension drug metformin reduces hypertrophy
If you’re into life extension, I’m sure you’ve heard of metformin. It’s a drug that inhibits hepatic glucose output and reduces inflammation in muscle. It’s among the top 10 most widely prescribed drugs in the US, and many people think it can increase healthspan and
Better navigation
We've merged the default and custom exercises lists and moved all navigation to the bottom bar.