Train in the
growth zone.
Duro tracks your weekly sets per muscle group against science-based volume landmarks. See if you're growing, maintaining, or overtraining — at a glance.
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You log every set. But do you know if it's enough?
Most workout apps stop at tracking reps and weight. They never answer the question that actually matters: is your training volume optimal for growth? Duro does.
Volume zones per muscle group
Your weekly sets for each muscle group, plotted against four evidence-based landmarks: MV, MEV, MAV, and MRV. Color-coded bars tell you instantly who's in the growth zone, who's just maintaining, and who's pushed past recovery.
Side delts at 4 sets? Add lateral raises. Chest at 14? Solidly in the green. Quads touching amber? Dial it back next week. Every decision backed by data, not gut feel.
See what's recovered
A full-body muscle map shows recovery status at a glance. Red means fatigued, green means ready. Know exactly which muscle groups can handle more volume and which ones need rest — before you walk into the gym.
No more guessing whether your chest has recovered from Monday. Open the map, check the colors, plan your session accordingly.
Every PR, every rep range
Pin your key lifts and watch your E1RM trend over time. Smoothed trend lines cut through noise so you see real progress. Rep PR tables track your best weight at every rep count from 1 to 20+.
You won't hit a 1RM PR every month. But a 10-rep PR on incline? That happens weekly when you're training right. Duro tracks them all.
Log from your wrist
Native Apple Watch app with true two-way sync. Complete sets, edit weight and reps, track rest timers, and stream your heart rate — all from your wrist. Not a remote display. A real training companion.
Always on. Even locked.
Your workout lives on your lock screen and Dynamic Island. Rest timer counting down, heart rate updating, sets ticking off — all without unlocking your phone. Glance and go.
Coming from Strong?
Import your entire workout history with one tap. Years of training data, mapped to muscle groups and volume zones instantly. You don't start over. You start seeing what your data actually means.
Stop guessing. Start growing.
Get early access to Duro when it launches on iOS.