Best Apps to Track Strength Progress
App guide
Ranked & compared
Tracking strength progress — whether your lifts are holding or climbing — is the best real-world signal that resistance training is actually protecting your muscle during GLP-1 weight loss.
Strength progress tracking means recording sets, reps, and weight for each exercise and watching whether performance holds or improves over weeks. On GLP-1 medications, maintaining or increasing training loads is the clearest evidence that resistance training is working as a lean-mass preservative. This guide compares the top three apps — Strong, Hevy, and Fitbod — to help you choose the right tool for logging your lifts and interpreting your strength data.
This is general nutrition and wellness information, not medical advice. If you're on a weight-loss medication or managing a health condition, confirm specifics with your clinician.
What you're actually tracking
Strength progress tracking means recording sets, reps, and weight for each exercise and watching whether performance holds or improves over weeks. On GLP-1, maintaining or increasing training loads is the clearest evidence that resistance training is working as a lean-mass preservative — more reliable than BIA scale readings that fluctuate with hydration. A Circulation review of STEP 1 and SURMOUNT-1 found that 45.5% and 34.3% of weight lost in those trials was lean mass; strength data tells you whether your individual trajectory is better than that average.
How we evaluated them
Apps included if they (a) log sets, reps, and weight per exercise, (b) calculate or display 1RM estimates or volume trends, and (c) have verified pricing from App Store / Google Play / official sites (July 2026).
The apps, side by side
No single app wins for everyone — each card calls out who it's genuinely best for, so you can pick on fit, not hype.
Strong
Free (3 routines) / Premium $4.99/mo or $29.99/yriOS / AndroidBest for: Tracking lifts, personal records, and estimated 1RM over time
- Clean PR tracking, 1RM calculator, and history graphs on free tier
- Fast set/rep/weight logging with plate calculator
- Volume-per-muscle analytics less detailed than Hevy; unlimited routines require Premium
Hevy
Free / Pro $4.99/mo, $23.99–$39.99/yr, or $74.99 lifetimeiOS / Android / WebBest for: Volume and progression analytics with a social layer and per-muscle heatmap
- Volume per muscle group; adaptive Hevy Trainer; can import from Strong
- Generous free tier with full workout history
- Best analytics and programming tools are behind Pro
Fitbod
About $12.99/mo or $79.99/yr (free trial available)iOS / AndroidBest for: Algorithmic progression suggestions that adjust working weights automatically
- Auto-adjusts working weights and recovery recommendations per muscle
- Guides progressive loading as body weight drops
- Subscription only; premium-priced; less control for experienced lifters
Why Strength Numbers Are a Better Muscle Signal Than the Scale
Your bathroom scale and body-composition readings can swing by several pounds in a single day based on hydration, meal timing, and glycogen storage — none of which reflect actual muscle tissue change. Strength data cuts through that noise: if your squat, bench press, or deadlift numbers are holding steady or climbing, you have direct, functional evidence that your muscle is being preserved.
Bioelectrical impedance analysis (BIA) scales estimate lean mass by sending a tiny electrical current through your body and measuring resistance. The problem is that water conducts electricity, so dehydration or a low-carb day can make your lean-mass reading drop overnight — even though you haven't lost any contractile tissue. Strength performance doesn't have this problem. A barbell weighs what it weighs.
This distinction matters enormously during GLP-1 weight loss. These medications can cause rapid shifts in glycogen and water weight, especially in the first few weeks, which makes BIA readings particularly unreliable during active treatment. Your training log, by contrast, tells an honest story. If your estimated 1RM on major compound lifts is stable or trending up across 4–6 weeks, your resistance training program is working as a muscle-preserving intervention regardless of what the scale's body-fat percentage says.
Bottom line
A maintained or rising 1RM is strong evidence muscle is being preserved; a consistent strength decline across 4–6 weeks — especially paired with weight loss — is a signal worth escalating to your clinician.
The Circulation Data: What STEP 1 and SURMOUNT-1 Actually Showed About Muscle Loss
A Circulation review of the pivotal GLP-1 trials found that 45.5% of weight lost in the semaglutide STEP 1 trial and 34.3% in the tirzepatide SURMOUNT-1 trial was lean mass — not fat. Those numbers are alarming when read in isolation, but they describe what happens under medication-only conditions without structured resistance training or deliberate protein intake.
These are trial averages, not individual destinies. The participants in those studies were not enrolled in supervised resistance-training programs, and protein intake was not controlled as an intervention variable. When people add two to three resistance-training sessions per week and consume adequate protein — roughly 1.6 to 2.2 grams per kilogram of body weight daily — the proportion of weight lost as lean mass drops substantially. The research on this is consistent: resistance training plus sufficient protein is the evidence-based countermeasure.
This is exactly where strength tracking becomes indispensable. You cannot feel whether you're losing muscle at a 35% or 15% rate. But you can see whether your deadlift is dropping. Your training log is the real-time feedback loop that tells you whether your individual trajectory is better than the trial averages — and whether you need to adjust your training, nutrition, or medication dose.
Bottom line
These are trial averages under medication-only conditions; adding structured resistance training and protein-adequate nutrition shifts individual outcomes — strength tracking is the real-time feedback loop that confirms whether your program is working.
Strong vs. Hevy vs. Fitbod: Which App Tracks Progress Best
Three apps dominate the strength-tracking landscape, and each serves a different type of lifter. Strong prioritizes speed and simplicity — you can log a set in under three seconds and immediately see your previous performance on that exercise. Hevy adds a layer of analytics depth, particularly around per-muscle volume tracking and a visual heatmap that shows which muscle groups you've trained and how much. Fitbod takes the most hands-off approach, algorithmically suggesting exercises, sets, reps, and weights based on your goals and recovery.
For pure progress tracking, Strong's free tier is hard to beat. It stores your complete exercise history, calculates estimated 1RM using the Epley formula, and graphs your strength trends over time. The plate calculator is a small but meaningful quality-of-life feature — it tells you exactly which plates to load on each side of the bar. The limitation is that Strong's volume analytics are session-level rather than muscle-group-level, so you can't easily see whether your chest volume is trending up while your back volume is flat.
Hevy fills that gap. Its per-muscle volume tracking shows you exactly how much total work each muscle group is getting, and the heatmap makes it immediately obvious if you're neglecting a body part. Hevy also includes a social feed and the ability to import your Strong data, which lowers the switching cost. The free tier is genuinely usable for most lifters — unlimited workouts and full history are included — though advanced programming tools and deeper analytics require Pro.
Fitbod is a different category of tool. Rather than just logging what you do, it programs what you should do next. It tracks recovery status per muscle group and adjusts suggested working weights session to session. For someone new to lifting who wants guidance on progressive overload during weight loss, this can be valuable. For experienced lifters who already know their programming, Fitbod's suggestions can feel intrusive, and the subscription-only pricing is the highest of the three.
- Strong: Fastest logging, clean PR graphs, free tier supports 3 routines
- Hevy: Best per-muscle volume analytics, muscle heatmap, generous free tier
- Fitbod: Algorithmic progression, auto-adjusts weights, subscription required
Bottom line
Strong is the fastest-to-log option with solid free PR tracking; Hevy adds per-muscle volume analytics on a generous free tier; Fitbod earns its premium price only for users who want auto-programmed progressive overload.
Progressive Overload on GLP-1: How to Adjust When Energy Is Low
Progressive overload — gradually increasing the demands on your muscles over time — is the fundamental principle of strength training. But applying it during active GLP-1 weight loss requires nuance. Reduced calorie intake can limit recovery capacity, and some days you'll walk into the gym feeling genuinely depleted. The key is understanding that intensity and volume are separate levers, and you should pull them differently when energy is scarce.
Intensity — the weight on the bar relative to your maximum — is the primary driver of the muscle-preserving signal. Your body interprets heavy loads as a reason to hold onto contractile tissue. Volume — the total number of sets and reps — drives metabolic stress and hypertrophy but is more recoverable. When you're in a significant calorie deficit, prioritize maintaining intensity and reduce volume if needed. Dropping from four sets to three while keeping the same weight is safer for muscle retention than dropping the weight to complete more sets.
Practical application: if your program calls for 4 sets of 8 at 185 pounds on bench press but you're feeling drained, do 3 sets of 8 at 185 pounds rather than 4 sets of 8 at 165. Your strength-tracking app will show the same working weight, preserving your trend line. Over weeks, as your body adapts to the medication and your nutrition stabilizes, you can gradually restore volume. The app's history graph will confirm whether this strategy is working — a flat or rising weight line with temporarily reduced volume is a win during active weight loss.
Bottom line
Prioritize maintaining training load (weight on bar) over training volume (sets × reps) during active weight loss — reducing volume slightly is safer than reducing intensity, which sends a weaker muscle-preserving stimulus.
When to Flag a Strength Plateau to Your Prescriber
Not every flat week is a crisis. Strength fluctuates with sleep quality, stress, meal timing, and even the time of day you train. A single week where your squat feels heavy doesn't mean you're losing muscle. But a consistent decline across multiple lifts over 4–8 weeks is a different story, and it's one your prescribing clinician should hear about.
The threshold worth flagging: a 10% or greater drop in estimated 1RM across two or more major compound lifts (squat, bench press, deadlift, overhead press, or row) sustained over four or more weeks, concurrent with ongoing weight loss. This pattern suggests your current training stimulus, protein intake, or calorie deficit may need adjustment — or that your medication dose may be suppressing intake too aggressively to support lean-mass preservation.
Bring your app data to the appointment. Screenshots of your strength-trend graphs, your estimated 1RM history, and your weekly volume totals turn a vague concern into a concrete clinical data point. This is the difference between saying 'I feel weaker' and showing 'my estimated bench press 1RM has dropped from 185 to 165 over six weeks while I've lost 12 pounds.' That specificity changes the conversation. In some cases, it may warrant ordering a DEXA scan to directly quantify body composition rather than relying on performance proxies alone.
Bottom line
A 10%+ decline in 1RM across 4 weeks on two or more major lifts, concurrent with weight loss, is a concrete data point that changes a clinical conversation — app data makes this measurable, not anecdotal.
What most pages leave out
1RM calculators (Epley, Brzycki formulas) are estimates with meaningful individual variation — treat them as trend signals, not precise measurements. Fitbod's auto-progression is algorithmic and proprietary; it can suggest weights that don't match your actual readiness, especially during weeks of high GI side effects.
We flag this so you can make an informed choice — not to scare you off.
❓Frequently Asked Questions
Strong is the best choice for simplicity and free PR tracking with a fast logging workflow. Hevy excels if you want per-muscle volume analytics and a muscle-group heatmap on a generous free tier. Fitbod is ideal for lifters who want the app to algorithmically manage progressive overload and suggest working weights automatically.
A consistent strength decline across 4–6 weeks — especially a 10% or greater drop in major lifts like bench press or squat — is a more reliable muscle-loss signal than BIA scale readings, which fluctuate with hydration. If you're losing weight but your lifts are stable or improving, your resistance training is likely doing its job.
One-rep maximum (1RM) is the maximum weight you can lift for a single repetition of an exercise with proper form. Since testing a true 1RM directly can be risky, most apps estimate it from submaximal sets using standardized formulas like the Epley or Brzycki equations.
Yes, Hevy's free tier includes unlimited workouts, full workout history, and a muscle-group heatmap showing which areas you've trained. The Pro subscription adds advanced analytics, custom routine creation beyond the free limit, and additional programming tools.
Hevy shows per-muscle volume (sets × reps × weight) more explicitly with dedicated analytics screens and a muscle heatmap. Strong displays total volume per session, but its muscle-group breakdown is more limited, making Hevy the stronger choice if volume-trend tracking is your priority.
Treat every training session as a data point rather than scheduling formal strength tests. Compare 4-week rolling averages of your estimated 1RM or working-set loads rather than week-to-week numbers, which can vary with sleep, stress, and daily energy levels.
Fitbod adjusts suggested loads based on your logged recovery ratings and exercise history, which can be useful if you want the app to manage progressive loading during weight loss. However, it requires consistent, honest logging of every session to work correctly, and its suggestions may not align with your actual readiness on days when GLP-1 side effects are high.
Strength tracking measures performance — the actual weight you can lift — while lean-mass tracking relies on BIA scales that estimate body composition from electrical impedance. Strength data is a direct, functional signal of muscle preservation that isn't thrown off by hydration changes, making it more reliable for day-to-day decision-making.
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Read moreOn a GLP-1, or thinking about one?
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This content is for general informational purposes only and is not medical or nutritional advice, a diagnosis, or a substitute for professional judgment. It does not account for your health, medications, or goals, and nutrition information changes over time. Always talk with a qualified clinician or dietitian before making significant changes to your diet, supplements, or medications. Curex offers compounded GLP-1 medications through licensed clinicians and does not sell or endorse the food or supplement reviewed on this page.