Strength IO: Workout Tracker

Most strength apps count your sets. Strength IO reads your recovery — and the runs and rides you log in other apps — then builds the session your body can handle today.

Everything in. Your session out.

Strength IO reads everything you do — your lifts, the runs, rides, and games you log in other apps, and your recovery signals from Apple Health — and builds the strength session your body can handle today. Heavier when you're fresh. Lighter when you're not.

It doesn't just count your sets. It computes.

WHAT IT DOES

• Adaptive training — Every weight is anchored to your real effort and per-muscle recovery, set by set. Fresh muscles get pushed; taxed ones get volume pulled back, never forced.

• Your whole week counts — Logged a long run in Strava, a ride on Peloton, a game in Apple Fitness? Strength IO reads it through Apple Health and adjusts today's lifting. No double-logging.

• Readiness from seven signals — HRV, sleep, resting heart rate, respiratory rate, blood oxygen, wrist temperature, and heart-rate recovery combine into one daily readiness estimate — not a single number from a single source.

• Training load — Your last 7 days are weighed against your last 28, so you can see at a glance whether you're ramping up too fast, holding steady, or backing off. One plain-language read — from well below to well above your usual — over a simple recent-vs-baseline chart. Build instead of break down.

• Smart volume — Each muscle's weekly volume is kept inside its effective range: enough to grow, never junk sets.

• Athlete Profile — The whole athlete in one place. A Strength Score for every muscle you train, rolled up by push, pull, and legs and scored from your own best lifts — so a cable row counts as much as a barbell. On the cardio side: your VO₂max against age- and sex-based norms, resting heart rate and heart-rate recovery alongside, and an efficiency trend for whether the same pace is costing your heart less. It's all tracked over time, so a plateau reads as a flat line and progress as a rising one.

• Private by default — The coaching runs on your device. Your data stays yours.

BUILT FOR The multi-sport lifter. If you train 3–4 times a week, wear an Apple Watch, and also run, ride, or play — Strength IO reads all of it.

STRENGTH IO PRO Strength IO starts with a free trial — the full app, nothing held back. After the trial, a monthly or yearly subscription keeps everything unlocked. Subscriptions renew automatically unless cancelled at least 24 hours before the end of the period. Manage or cancel anytime in your App Store account settings.

Terms: https://strengthio.app/terms Privacy: https://strengthio.app/privacy

iPhone & Apple Watch.

Estimates based on your data. Not medical advice.

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